I think some nice QoL changes would be to make res not go on CD if you aren't in a party. It would have the same effect as being in a party and using res that resurrects no one - res doesn't go on CD. Also it would be nice if you can get 1 second of invincibility frames after res to make sure you get critical buffs that may have prevented your death (e.g. hb or magic guard) instead of an instadeath after res.
Have you tested using res out of pt? Few months ago, I accidentally used res on my bishop when it wasn't in a party and it didn't go on cd.
As i remember ress without party should've seen only to you (other people cant see you casting the skill) and its just will prevent from going on cd. idk if its still like that or not or its was a bug, but i could just spam ress and its never went cd unless im in party.
Ress goes on cooldown out of pt too. With lvl1 anyway haha. Also the ressurection skill is visible to people not in the same party.
I just tested and realized, res doesn't go into cd if used while you are in a pt but in the absence of pt members or alone in the pt.
I'm checking with the developers on this matter (i.e. no CD if used while not in party, and 1-2s of invincibility upon being ress). But by no means it's a guarantee that these will be considered.