Custom Battle System
Sorry to say, but your chances of getting this are pretty slim. Unless it's an easy mod of one of the existing CBS's or the DBS, scripting a CBS is a long, difficult process, and unless you have a scripter who owes you a favor, you're not too likely to get it. Feel free to try, though. You might get lucky.
Once again, be specific about what you want. Include mock-up screenshots. If it's a copy of a commercial game battle system, describe the system in detail and post screenshots. If it needs to work with another script, like changing equipment in battle, for example, let us know ahead of time.