You denounce a few things about the movie but can you tell me what they could/should have done instead?
Let's start with the volcano. Do you have an alternate idea how the gang could get up that mountain quick in order to be there prior to Pterano, Rinkus and Sierra (who could have been there within an hour but what would the movie have to gain from them being there a day before the gang even arrive there?
I would have changed the plot in such a way that the Pterano would still require some information from Littlefoot or one of the others to find the stone (or some additional information on what exactly its alleged powers were or how to unleash them). Such a simple change would correct the logic flaw of why the flyers weren't able to get to the stone first.
Such a plot could even give Pterano a reason to abduct Ducky. Forcing the other kids to follow them so he could get more information from them in the Mysterious Beyond rather than in the Valley under the watchful eyes of the kids parents.
If Pterano abducted Ducky more silently (without causing an all out stampede in the Valley) a plot would have been possible in which only Petrie realized that Ducky was abducted by his uncle. Not only would that have caused another conflict of conscience for Petrie but it would even have corrected the major flaw of Pterano's deliberately provoking the adults into persecuting him (perhaps he could have given Petrie a "follow me on your own without the parents!" kind of message).
The idea (of the Rainbowfaces who are interesting characters!) is actually quite cool. Remember this is made for kids, not for our small group of adult fans.
I agree they were interesting, but the Star Trek beaming in the end seemed really ill fitting to me. Had they been kept more mysterious (similar to Doc) I think it would have been more impressive. This is of course a matter of personal taste and I think I am pretty much alone with the view that Star Trek, gore, science fiction technology etc. got no business in the land before time.
Strange colouring... okay I get that it shouldn't look like that but seriously what is so bad about that?
Again a matter of taste. Personally I think a volcano spewing something like spinach is something in need of improvement. If you don't feel that need I am certainly not out to convince you others, I am certainly not out to talk you into having a problem with it.
You're complaining about deus ex machina solutions? Well, they're everywhere in movies, you know?
True and wrong at the same time.
There are plenty of situations of last minute saves. But most of the time they had been built up and were not something that could have happened all along (like it would have been the most natural matter of course things imaginary for the adult flyers of the valley to go after Pterano after he abducted Ducky). In LBT 6 we see grandpa to the rescue brought there by Littlefoot's friends and Doc's previous farewell also made his appearance plausible.
LBT 5 perhaps had the extremest case of Deus ex machina in the form of Elzy's sudden appearance. But while that was not an elegant solution it was at least something that could possibly happen. A flyer capable of carrying Littlefoot, Cera and Spike is just a lazy excuse. I agree that one shouldn't apply too extreme logic on land before time movies. But I still think there is a difference between bending plausibility a little and making up something outright impossible defying all logic. If you think different, that is fine and I am not trying to convince you otherwise. Personally I want a good story to like rather than so much wishing to like a story that I don't require for it to be good anymore.
Nobody knew if the Stone had the powers it was predicted to have but I'm sure the grown-ups wouldn't just let Pterano gain that possible power. Even if it's just non-sense (as it turned out later on), could they risk that Pterano might gain huge power in the event that their doubts turn out to be false?
As I already wrote in your other thread the makers of LBT 7 had taken extreme efforts to establish that the adults in the Valley didn't believe in the stone of Cold Fire. They even had Cera's father repeat that after "Beyond the Mysterious beyond" to make sure that it was perfectly clear that the rainbow faces didn't convince anyone. If that is still not enough to convince you that the adults in the Valley didn't care at all about the stone the fact that they didn't hurry to prevent the flyers from reaching it. The alleged powers of the stone didn't play much of a role in the adults discussion.
It would have been odd enough if those powers had played a role, because it has never ever actually been specified what exactly that stone was supposed to do. There is absolutely no reason for Pterano to believe that the stone would allow for him to dominate or controll anyone at all (which I consider another major plothole of LBT 7).
In spite of all that, I do not hate LBT 7, but I thought it a great pity that some good ideas were largely wasted due to flaws such as those mentioned above.