Feature request: Add button to editor

I think this plugin would be perfect if you could add a button to the editor’s toolbar. This should bring up a popup, where I can just paste the Javascript code. That way, I don’t need to:

• remember the [js] syntax
• switch to text mode before inserting javascript code

Feasible?

http://ww.wp.xz.cn/extend/plugins/allow-javascript-in-posts-and-pages/