The (ps1) games that need two nubs are very few in number.
I don't recall that it does anything in pops now but provide awkward access to L2 & R2.
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having 2 nub's on the PSP-300 would work with regards to the backward-compatibility issues.....desighn the games for the older PSP-1000/2000 systems, and just have the right nub emulate the face buttons ([],O,A,X) most (if not all) of the first person shooters use the face buttons like another joystick anyways, so in theory it should work.