Plain mmf sometimes takes a few days to dry. Most here will do 1/2 gumpaste and 1/2 fondant. Kinda depends on the figures. Sometimes you can put them in oven with just the light on and it will dry them a little faster.
I have used MMF for figures if you check out my pics I made the mini pumpkins out of MMF, they did take quite a few days to dry hard though, the fall leaves that I did I used 50/50 MMF and Gumpaste, with the 50/50 its going to dry quicker but still be good to work figures with.
good luck! 
Yeah Wilton Fondant works good for figurines... but it really tastes pretty gross.. so if you use it for figurines instead of covering a cake with it that is your best bet!!! 
To bad it tastes so gross. Great for making figures but i prefer mmf on my cakes.
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