i'd like to give them a 50/50 all or nothing revive, while other orks always revive you with low health a painboy will either revive you to full health or kill you, which is usually what i think when i see a painboy trying to stitch up an ork: either he saves him and the ork it's ready to fight again or he chops off the wrong part and the ork dies. to offset for that you could make it so that if the ork dies the painboy gets a refill of his combat juice or the other orks get a buff to combat (which you can fluff as them fighting harder to avoid getting an "operation" from the painboy)
No, how about not adding dumb death like that? As a separate kit choice, maybe, but the bog standard healing item for painboys. or anyone for that matter, should not have that kind of "lolrandom" otherwise you end up with ork players avoiding painboys like the plague (which IS fluffy, as I'm sure someone will point out, but mechanically it'll do more harm than good).
Simple it iz, give em a healing stabby bitz, an a syringe gun, dah gun does weak damage but debuffs and poisons, an if yah shoot an ork wiff it, they get tuff. Dat way, he's a healer an' a fighter. Keep it in yer 'ead, this is a support class, he's a force multiplier, and needs tools that increase the efficiency of his entire team, so single target, aim/skill based debuff and harrasment guns are a great choice, especially if they synergize with their melee, such as the toxins of the needle gun and the combat syringe claws combine to make the enemy explode on death, damaging enemy's and buff'n the boys in a nice shower of blood and medically active spores.
I imagine the painboys having an area of effect of a health boost because the boys believe their health improved just from him being their. Or giveing them an attack boost because their afraid of needing his help. Also healing faster with low quality.
Good idea, but keep in mind that, if we were to go with the old 3th Edition "Orks can do whatever they wan't, as long as everyone think they can", there might as well not be any balance, because Orks think they are the bestest. Because they are. Git.