yes can totally be done, about the sound.
go to painkeep/sound/player, and copy over the gib sound you want to use over to ID1/sound/player and rename it to gib.wav
base quake only uses one gib-sound though, so you can only use one of the painkeep gib sounds in standard quake
about the poll, i vote no. telefragging is part of quake, you shouldnt remove this awesome feature from the game just cuz some people got butt-hurt over the fact they got telefragged. dun whine if you do get that, should be more clever and not jump into a portal if you're being chased. but dun cry if you are dumb enough to do so and then get tele-fragged
its like crying to remove weapons from quake cuz you got shot down with a shotgun. you dun cry about that either, do you?
why not? cuz its part of the game, just like telefragging is
if you dun wanna be telefragged, dun jump through a portal if someone is close behind you