These are not new problems by any stretch of the imagination.

(1) is solved with Interact With Target. Bash that into the forum search and you'll find all you need.

(2) is solved by either doing what you're doing, having them re-follow the main (assuming they're in range) or having them "interact with target" on the guy you're bashing until they're back in range. Interact with target has a much longer range than follow.

The interact option to bring them back into the fight will only work with click-to-move enabled, and you'll find that discussed in the same threads as "interact with target".