http://www.atariage.com/forums/index.php?showtopic=130508
at this link there is a reference to a texas instrument vdp programmer guide, by texas itself.
It's a newer document compared to the usual tms vdp datasheet, because:
1) do a mention of the mixed undocumented mode.
2) explain that with (1) only the first 8 sprites on screen could be used. if not they will duplicate.
3) about the multicolor mode the doc outline that is not supported in the phantomatic AVDP chip. (I guess will be a successor of VDP).
So, stops with undocumented or unsupported modes, basically texas instrument recognized this mode as legal, with some limitations.
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oes not differ at all the chip is the same. they say 35 planes because they count 32 sprite plane+foregroun image+backdrop color+external vdp plane..... 
I still like "our" MSX-1 vdp.