That's interesting to know that Full Tilt allows you to decide whether to use tourney dollars or cash from your bankroll or whether to mix and match to enter a tourney or a SnG. I play on PokerStars
and unless I can tick a box that does otherwise, it will always take your buy in from your tourney dollars, except for cash games of course. Personally, it would be quite nice to have the choice because I like saving my tourney dollars for specific tourneys/satellites rather than having to use them on SnGs. Interesting to see how different sites have different ways of doing things.