I suggested something similar but the concepts were a little different. Ghost seeks out and auto revives allies within a short distance from you. Ghost picks up or regenerates ammo for you. This could be in a variety of different ways but depending on the regen time it could even work for heavy. Like 1 rocket per minute. Nothing that would really change boss encounters but would give an excuse to unleash heavy on various adds more frequently. Ghost supports with low damage suppression laser that can stagger target similar to HCR. Lots of things they could do with it that would be fun.