Not interested until I can put my own games on there.
I would say in addition it needs a way to support dual-anlaog controllers like a PS1 DualShock or a PS2 controller (via USB adapter).
So this one isn't as simple as just hacking the console, it needs a new controller driver on top of that.
You realize a lot of games on PS1 don't even support the analog sticks right? I mean it's probably like 5% of all PS1 games at most mostly the very late titles.
Uh no, the vast majority of PS1 games released from 1998 onward supported the Dualshock. There were maybe a few games that actually required one though, Ape Escape is the only one I can think of.
Ace Combat 3 required it too, if I'm not mistaken.