Zebrawood is not known to be super stable. It often has grain moving all different directions inside, which causes different shrinkage rates in adjacent locations, causing openings. With careful selection you should be ok. Watch the grain! Internal tension is also common with this wood for the same reason. I am very cautious about using zebrawood. It also is very sensitive to climatic change, (probably also due to the potential for differences in grain characteristics throughout a given board) I have dried it, milled it flat, watched it move, and then watched it move back. my 2 cents... I have had more than one 'fatal' problem with this wood, in learning about it.
As for toxicity, I treat all wood dust as toxic, though some are noticeably worse. All should be respected.