Well, before I even start, I tried using this system one time. Very easy to work with, just very, very dull to start making the cards :3. Also, it's in Japanese, and Google Translate isn't exactly perfect(They translate the word for battler from japanese into the english 'butler'.)
Anyways, what your asking is not a question. It's more of a request. You should post this into script request forums if you'd like someone to attempt to do it for you.
Secondly, some of the features are already within the system, you just have to work with it.
Anyways, I tried looking, but there are no current scripts that do anything of what you need, since this is a completely different concept of a system, since mostly people make battle-addons or their own standalone scripts.
To change the maximum, you can edit the GUI(Window) up a bit, and make it display the list. It would require some work, but that's what we're all doing while developing games, right?
As for the rest, I don't know. Just remember, it's really, Really hard to find addons/edits of stuff like this, because of how different it is from the addons people make for battle systems.