You're not the only one wishing for that, but the video chip is completely unemulated (not to mention some games need two of these chips to power both screens) which may be a problem as PowerVR documentation isn't really out there - the GPU is similar but not identical to the Sega Dreamcast/NAOMI chip, which is probably the only reason the boot-up text is even readable at this stage. And then there's the problem of having no inputs hooked up (buttons, doors/optics, coins/notes, hopper, comms etc.) which could even be the main reason why they hang after the POST, just like the MK5 games used to do (speaking of MK5, the first games were preserved way back in 0.129u3 and only started booting in 0.180).
The best thing for now would be to find and/or document as many things as possible, although it will be very difficult from next year when the hardware ends up in landfill (most venues already ditched their MK6 games this year, at least down here in Melbourne - you're lucky if there are half a dozen MK6s left even in a large venue with 100 machines).