There's a video somewhere of someone doing a L+R glitch to get through a wall, on a real console. It's tricky, but not impossible; it doesn't even require breaking the D-pad.
If I recall correctly, the PSX D-pad is connected underneath the surface of the controller; it only looks like four separate buttons. I could be wrong, though.
I know skamastaG performed some amount of L+R glitches with Super Mario World for SNES, so it's at least possible there too.
Speaking of, the PSX controller had four individual buttons instead of a D-Pad. Does L+R/U+D also work there?
SNES only works with some controllers. With others it does not. I can not do it on any of my controllers, whereas I could do it on JXQ controller.
If you're interested in LttP glitching and haven't seen these already, there's a great Glitch FAQ on GameFAQs with a bunch of fun things to try with U+D. There's also a (GBA version only) "Minimalist" walkthrough that shows how to U+D glitch your way up to and through the Palace of the Four Swords with only 3 hearts and minimal equipment (I mentioned this one in my earlier post). These FAQs are really interesting and show just how much a game can be broken using a single glitch. I personally think the GBA one would make a great TAS if done right. It would pretty much be some item collecting followed by a nice boss rush through the Palace of Four Swords. I would love to make it myself if I actually had any skill at TASing LttP.
I actually have a controller I modified to allow for U+D/L+R and I have a 0 death game done in less than 10 minutes. (Well, it was 0 death until a friend started it up then saved and quit.) My controller mod is poorly done two though, I ended up using wire cutters to split the buttons so the get jammed together really easily. One of these days I should take it apart and file them down some so they fit better.
