ISboxer works, But I never did quite get it just right. You can just target and hit F to follow, and then you choose which action you want on target of target.

For example, I just used a simple lightning bolt that would attack ever target that my main had selected. A few times, I'd have to switch over and hit another ability just for survival.

I do know Keyclone works with it across multiple machines, But I'm not sure on just one PC. YMMV.

Stephen