if you're gonna game on a Mac, i'd suggest installing windows via bootcamp. ime most games simply run better that way anyway and you don't have to deal with the issue of games that aren't MacOS compatible.

>one-directional shields and turned it into team strategy game with much less room for individual skill

There's plenty of room for individual skill, which goes beyond hitting Q. One-directional shields only reveal that teamplay is necessary, by themselves they don't add the necessity of teamplay. A poorly coordinated team doesn't do a good job. Even if both teams didn't use shield tank heroes, you'd still need just as much coordination.

They've had custom games with the workshop that can serve most of what you request here, might be worth checking out