The accelerator is just recessed holes that have been painted black. The foot rest has plastic (not rubber) studs that probably don't offer a great deal of grip.
Here is a diy for the integra pedals:
http://forums.clubrsx.com/showthread.php?t=563867
I've ordered a set so I'll let you know how well the foot rest fits. From the looks of it though, the rsx foot rest is pretty much the same as ours.
As for defects, from my understanding, it would only be if you are removing a safety feature from the car i.e. since only the brake and clutch pedals have rubbers, for replacement pedals only those pedals NEED rubber. Note: need and want are different things. *smiley*