As the title says really.

Without a radical overhaul of just about everything, stealth is essentially a 'quit' button. Remaining invisible but still being able to be targeted could reduce the annoyance. You can frequently follow the blue fog, but do nothing. If they can be targeted, then getting clear takes a bit more skill.
Maybe also disallow medkits in stealth too?

On a side note: Stealth requires TC, so there's not much point in using stealth as a low tech user and no disadvantage to high tech users.
Perhaps something else, like WPW or IMP instead?