Ok so:

Ease of use:
From experience I know that people (especially those between 10 and 14) tend to not read instructions, therefore a system like the mod system should be made to automatically download scripts; like the mod system scripts would have to be approved.
Now this leads us to another ease of use problem: "How do I do stuff in this script..." My thoughts would be to make an ingame script help system. You press say: F2 and then it triggers a hook which would then display help / go through a tutorial / demonstrate the script or something like that.

Scripting Functionality:
Two major parts of toribash are replays and online play. Seeing as scripting can't affect either of these things, it is flawed.
We can change almost every aspect of toribash, but almost none of those changes are recorded in replays; if there was some kind of new replay format implemented that for example: loaded the script and emulated input and such then that would be a major step forward in scripting.
Another aspect which I mentioned above is online play. I seem to remember Newbluck (I think) showing me a system he had made for his server (he had full access to Asia servers, he could upload his scripts to them). His system consisted of a server script and a client script. The server script would send variables which the client script could then use for whatever reason. This system seems to have unlimited possibilities, if it were to be implemented (would be easy to implement if there was the script database as mentioned in "Ease of Use"), there would be a vast array of epic scripts such as online pummel, online punchout, online.. shader maker? It would be epic! (sure there would be lag but hey, ONLINE PUMMEL).

Anyway I hope you take these suggestions into consideration. Scripting has the possibility to make toribash 100x better, but it needs these improvements to do so.