Well it seems I run into the lq instruction a lot, load quadword. What does this do?

Also, I see that when you change the value of an address and have the view set on opcode/args, it changes the instructions.... is there a way to really change the instruction? I.e. changing a stw to like lui..? Would I have to write a sub routine for that?

And could I get a list of the common (advanced ones would be nice, but beggers can't be choosers) instructions? I plan on doing a few subs soon, just because I can't stand not to; on the wii, you change the instructions quite often and it bugs me not to be able to do it as commonly on the psp.