Yes, I'm using your script wichu, but I couldn't find anything about disabling the use of Hi Jump Kick, Jump Kick, Magnet Rise and Splash. Fly and Bounce were handled but I couldn't find anything on the other moves. It seems I was misled about Gravity stopping the flee/switch commands, I got that from the UPC. I'm a bit unsure about it disabling Splash as well. The only place I've been able to find that is on the UPC. What would be the point of disabling a move that does... nothing?
As for adding GSC items, the only ones I'm going to put in are the extra balls that were in GSC, such as the Heavy Ball, Love Ball etc. The GS Ball won't be included as it wasn't technically a Poké Ball.
I wish I could add the animations, but the animation editor in Essentials is the one thing that I can't get on with. As much as I try it just makes me frustrated every time I use it. There were whisperings around the Essentials thread about an animation project, If you asked around you might be able to find something.