Hi - Keyclone does have mouse replication for each screen, I found it the other day by accident and it works well - each mouse pointer goes to exactly the same spot on each screen so you could easily use blizzard.
I've never heard of gamecommanderpro so can't comment but have been a long time user of keyclone and can endorse it wholeheartedly - btw I'm in aus and the lag isn't that bad lol I get 250ms.