mangue: Move-and-a-Half Chess sounds very promising to me. I'd love to playtest it first, to see whether the bonus values that I mentioned give a good balance between White and Black wins. If it generates good complex play and yields about 50/50 results, I could see asking for it to be supported here.
It reminds me of Three Checks Chess, with its wonderful imbalances between force+development vs. the number of checks delivered. Plus it could have some great mating threats and sequences like those seen in Progressive Chess.