hm, what type of RTS would it be in terms of tribes aspects?
you could have it be a complete tribes -> RTS port, in which case it'd be CTF, with gens and infinite energy for big invs, and limited energy for remote invs. You'd have assigned customizable turret formations. Arrangements for your 10 man squad; 5-5 splits, 6-4 splits, clusters, HO rape, cappers, static LD, chasers, HOFs, etc.
The toughest thing would probably be setting the tactic variables for the 'players'. like...discing a HOF, MDing a hof, sniping cappers, MDing cappers, chasing, loadouts...etc. How often would a light capper be able to disc a hof and grab? etc.
If it's a more traditional RTS...You could go a lot of ways. You could have a limited squad still, possibly 10-man, or 14 or 16 or 20... Then have each team's "base" really be an objective that can be taken over (just like tribes...), upon capturing an enemy's base all their units become naked lights and they can 'cluster' or get the base back.
I dunno, this is a cool idea that i can talk about for years so im going to stop