Haven't tried it... it might react oddly, but it might work - when it creates subsets it copies the data from the original MSE file.
Share some the templates/content you use and I'll take a look at it when I get the chance.
Pretty cool stuff, Ander!
MSE is cool, but it annoyed me when trying to select which cards to print.
I quickly whipped up this little java app. What it'll do is load up a master set built with your D&D power card template and allow you to build a "subset" from the selected cards.
The subset...