I’m not much of a pro, and I’ll still need to give a try to your newest modifications, but I’m curious – why we need to go all the way from waypoints in the dungeons at all? They are usually quite far from destination. Why the character can’t respawn next door or next to chosen party member after some time? (I know, waiting is more boring than running, but that can be pointless as well) Time span could adjust to a number of players “alive” and there still could be an option to respawn at some WP, if party would decide to regroup in a safe distance. Just an idea.
Healing “killed” ally is usually impossible during an intensive fight in the dungeon. It’s even better for the team if such person just respawn and run all the way to continue the fight. Of course healing fallen allies (who can still react, “fight”, hide, etc.) is a great mechanic, I really like it, but if they “die”, there’s no way to help them in the middle of a fight then.