Suggestion

In the event of mission consisting of teams, I can very well combination attacks are most likely going to begin. I believe before it even starts there should a system concerning the combination of certain attacks, & the basic "Fire + Wind" or "Lightning & Water"

Well propose whatever it is that you're asking for. Are we talking more powerful combination attacks etc? Since its all hypotheical at the minutes and in some case common sense. But do go ahead and let fly with your thoughts. I will ensure they get taken on board.

I feel the easier option would be to register a jutsu and have the word count split between each of the party members.