I enable hi-res support if I'm playing SoM or SD3, but very few of the games I play use it(as far as I know). I don't think FF4-6, CT,or the BoF games use hi-res mode(correct me if I'm wrong), but I haven't played much of the BoF games yet.(on my backlog, & nintendo_nerd told me about
the retrans patch for BoF2) Enabling it doesn't increase crackling very much, but I disable it in games that don't use it.
Games that use hi-res mode do look very strange if you disable it, though. I don't have a list of games that use it, but if it's needed I'll enable it. My PC is pretty damn slow, so I disable any settings that decrease speed. I know tons of people hate xBR shaders, but I want games to run at a constant 60fps with 5xBR enabled.