The only snowboard boot lacing system that I've found to be worthwhile comes from Salomon. Instead of conventional laces that you have to tie but then come loose, it features a cinch-up drawstring lacing system with a locking mechanism. Put your foot into the boot, pull the drawstring tight on the liner, lock it, then pull the drawstring tight on the outer boot, then lock it. You're done. Not only does it provide awesome support, it stays tight all day, and you can put on your boots with gloves on for those cold days.
It looks like this:
http://www.sandyhome4rent.com/salomon-laces.JPG