Sorry if nobody's answered yet. I wanted to let JonLeung answer since it's his site after all but he doesn't seem to have noticed it. Anyway, VGMaps only accepts maps directly from their creators, and taking (or stealing) them from another site is not acceptable. Hope that answers your question.
You could either contribute your own maps or maybe ask this
Fabio Albergaria fellow who's already mapped several MSX games here.
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"With the first link, the chain is forged. The first speech censored, the first thought forbidden, the first freedom denied, chains us all irrevocably." [...] The first time any man's freedom is trodden on, we're all damaged. - Captain Jean-Luc Picard
B*tch, meet reality. Reality, meet b*tch. - Me