Yes, I have.

Of course some adjustments from the regular conquest mode would need to be made.
For example reducing the map size, a five minute timer, and one faction on each map would need to have a target.

Let´s say Rebels have to blow up something within the time limit, Imprials have to stop them.
Rebels win if the target has been blown up or if all Imperials have been killed.
Imperials when they wiped out all Rebels or when timer runs out.

I think it wouldn´t hurt to have medics in that sort of game mode, who are able to revive team members.

Probably not everybody´s idea of fun, but I would definitely like it.