If there is no other choice but either tab-target or FPS, lets make this 10000 gazillion and one, that is the price im prepared to pay

I highly doubt any tab-targetter can be successful on a decent level now. The last massive one that came (r**t) is already struggling with player base from what I hear. (it's a very limited struggle, but still)
plus I highly doubt based on ER and other Masthead projects that a tab-targetter is in their mind.
You would probably have to look more towards FE's system if it's not a straight up mmofps.