I’d love to see a skill that could cloak a small group of mercs, making them both invisible and undetectable by heartbeat sensors. Firing while invisible would be bad, so maybe it could flicker the whole group if anyone makes an action. Could be centered on a merc, but might be more appropriate centered on a station.
It seems to me that the largest advantage is knowing which path the enemy is taking, so a stealth station could really mix things up, especially if the team worked together.