To correct the limit animations you need to make a kernel.bin like the one jeet had in his psx mod. Then all the limit animations will work properly. I couldn't include the kernel in my party swap mod because the kernel loads into memory only once when the game starts and then it cannot be swapped. Yes you have to hex edit the ab files(just copying and pasting won't work every ab file is unique), but that isn't how a new animation would be created. That is how you assign already existing animations to an action. So Jeet had to assign animations to actions that didn't always match because no animation existed.
After thinking about it if you will tell me which shinra characters you want to replace which hero characters I will make you a set in that order with a matching kernel.bin. I'll pretty much only have to rewrite elena's AB file and make the new kernel to fix the limit animations.
I see, i am a total noob when it comes to the kernel.bin and hex-editing though. But am quite good with the Kimera program as well as the game itself =).
Okay thanks, that would be great if you could help me out by doing that!

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I think the following:
Barret - Dyne
Vincent - Sephiroth
Cloud - Rufus (Done - but not sure about limit breaks).
Aerith - Scarlet (Done - but i saw you managed to also use the NPC field model with all it's animations and bones intact? How did you manage that?)
Tifa - Elena
The rest of the characters you are using used by those you replaced them with - Palmer, Hojo, Reno and Rude.
Red XII - Dark Nation (Done).
Not sure about Tseng, i could possibly use both Dyne and Tseng in a submod and let people chose which ones to use.
Finally i wanted those Jemnezmy animations (sexy female villain) in order - possibly one could use that model for Jenova? In the PSX-mod it's already done in that way.
But how did you manage to make field models use all their bones etc? Is it a similar process? Thanks for your help as it will help me to finish a Shinra Mod. I may add Tseng and the Jemnezmy/Jenova as alternatives.
Tifa - Jemnezmy/Jenova.
By the way, would it be possible to also give Rufus-Cloud etc their animations? So that enemy NPC Cloud is using the sword and not a gun?