I really like the inp stuff because it makes the MAME games completely ironclad.
An examination of the INP and WLF files is the simplest and most straightforward method of validating a MAME score. However, for a time-sensitive event (like the WCR #3), where scores must be achieved during a 24 hour period, it's far from ironclad. Any player could easily adjust the date and time on their PC to 06/22/13, play until they put up a score they're happy with, and then replay the INP on Saturday at the appropriate time. The recording will pass all wlfview validation checks, with no evidence of wrongdoing. With only a few mouse clicks, unscrupulous players could give themselves several days to record a high score, instead of just one.
Yes, it's incredibly lame. No, I don't believe anyone here would disrespect the community by employing such a low tactic. But we should certainly be wary of the possibilities.