I run dual monitor too you have to configure the jdesk module the workarea it sets and also the vwm module.........one word of advice you need to read the docs if you want to use litestpe spend a whole day reading all the docs or else ,man you gonna get jumbled up and eventually you'll be able to change themes to your liking I don't bother using any of the vwm modules.

The only porblem you'll have with dual monitor is labell module it can be set transparent on the secondary monitor but then agian that is wery trivial problem else Litestep is da Shiznit