That's a deal-breaker. Sorry. I'm familiar with Niko's Arcade as I have it on my paid-for board and all but a few disfunctional games (I can count them on one hand) work properly. I have over 500 games total, and forcing me to play games I don't like just because they work here is a non-starter.
I should also mention that Niko's last version of Arcade hasn't been updated to work with 2.0 Gold at all; one of the major reasons my arcade works is because it's 2RC2. I'm not saying any of this is specifically your fault--I'm just saying that claiming you've got an arcade on 2.0 Gold using Niko's arcade is pretty much wishful thinking. 2.0 Gold has a known serious flaw in this department that should win the Hasty Pudding Award. It's also why I prefer to test-drive 2.0 Gold on somebody else's board. And as long as this major flaw exists, I'm hanging onto my 2RC2 no matter how much anybody/everybody tells me I should upgrade.