One of the things that always bugged me about the 40k RPGs was the ability to spend fate points to instantly heal. The second I read the rule, I got a bad feeling in the pit of my gut. It's just too gamey, too detached from the source material, and frankly too much of a "HEALING SURGE!!!"
Characters could easily save all of their fate points during a mostly roleplay-heavy session, and blow their load all at once at the end as they all miraculously heal gaping wounds, head traumas and hematomas.
The first, and in my opinion, best solution I came up with for this problem was to allow acolytes not to heal with fate, but instead to reduce damage. I understand that healing, especially once you've passed the threshold for heavy wounds, can be slow and painstaking, and one or two fights can easily bring a party down to near-death status, unable to contend anymore.
What I do is allow acolytes to spend fate after being hit, and after hearing the total damage, to reduce that. Instead of healing 1d5 wounds instantly, they can reduce the 8 wounds they took from that lasgun shot by spending a fate point. Fate can be stacked, to reduce 2d5, 3d5 etc. from a single attack.
I found that in practice, it is still giving the acolytes healing (albeit instantaneously at the point of impact), feels much more fluffy (fortune favours you with a grazing blow rather than a kill-shot) and avoids the altogether awkward situation of having the acolytes enter the boudoir leaking vital fluids, and coming out minutes later with a new tan and a slick shave.
What do you guys think?