jm /ëÎw À´·Â.^*kÝ}¹"Pñ#×*ÇX!ñ6\ÎL¯No. You *CAN* have both parties to commit a hash of a value @ a funding address, later combining these values w/ MOD(A+B) to get a psuedo-random value (see chainbet protocol).
https://whatsonchain.com/tx/b3388f0607e94a63ef9265fea8666376c4a68f417d3f84e9eb3f856fdf15b830