well if it's a problem for a lot of people, I can do it. But I'll have to look exactly what's the best thing to do because I know that a lot of developpers works very differently with exported animations and I can't re-export the whole animation sets each time someone ask me to do it, because there is a looot of different ways to do it (some devs prefer a unique spritesheet for the whole animation set, others would prefer one spritesheet per animation, else will ask me for one gif per animation cropped with the minimum size for each animation, others would like one unique gif but with all the animations in it, you want me to export separated gifs but with a unique size which would be the same for each animation, etc.).
So that's why I've only exported it as folders with separated frames for each animation: It's the best way to allow people which will prefer something else to quickly modify it so it fits to their own way.
But I hope you understand that I definitly can't take time to export this pack in all the different ways people would asked me to do, it would take me a lot of time.
Also if you want to know what I would do in your situation: I would simply open Photoshop (or an equivalent), import all the frames of all the animations in a same canvas. Then I would crop this canvas to the minimum size so I'm sure it fits to the maximum size of all the frames (and so it would be the same size for all the frames of all the animations). Then i make photoshop turn these layers into animations frames so that it creates a long sequence of all the animations. Then I just have to export all these animations separatly as gifs. So I'm sure that all these gifs will have the same size :)