I'm pretty new to the PC gaming thing, but I really wish that it was standard for titles to give you the opportunity to lock the frame rate in various increments. The Witcher 2, for instance, sits at 45 fps on average for me. However, sometimes it'll drop from, say, 50 to 35 which is incredibly jarring. It 'feels' much worse and is more noticeable than a console game going from 30 to 25.
Clearly it's fantastic when it's all is smooth at a higher rate, but it would be nice to have the option to lock it. However, for me, running a game at an almost rock-solid 30fps would always take priority over a considerably higher but much less consistent nick. It's a trade off, yes, but available as an option, I'd take it without a second thought.
Of course, there are some visual options I won't disable.
This game can go from looking wonderful to utterly bland bereft a few settings.