There's a feature request that's been sitting around for not quite three and a half years that I really wish would be implemented: VWR-1186. It asks for a way to create and restore preferences with a simple dialog.
The obvious use for this is photography--until we all have infinitely fast graphics cards, you'll want to switch to a high-end but slow setting for still photos, and then return to a less fancy but higher fps setting for other activities. You may even have a bargain basement, fps über alles setting for gaming or racing.
I bring up the issue now because this morning I had switched clients because, for some reason I have yet to figure out, the computer I'm using over the holidays provokes the issue I used to trip over at home with Kirsten's client (though it's not unique to Kirsten's), in which the SL client would quickly consume all available RAM and bring the computer to its knees before crashing. I fiddled some with the graphics settings and was about to turn on deferred rendering when I noticed the frame rate in the low forties even at "ultra" setting, and decided 40 fps has an appeal of its own if I'm not taking pictures.
P.S. Many thanks to Elysia Snook and Val Suisei for a wonderful conversation.