You can change the layout of the keys, but not with FFR. I'm not sure what, but someone can tell you I'm sure. As for the freezing in the middle of playing, my sister's computer does that. It's just a lag in the connection. Depending on how bad, it can freeze the computer itself.
I know there's a connector you can buy that hooks up your Ps2 controller to the computer. Something like this. I have something similar, but I don't know what it's called (not this same one). It lets you link your pad to Stepmania, but I'm not sure if it lets you hook up to FFR.
And as for alternate ways to play... you can actually play with the mouse, if you really want.
What do you mean by "change the layout of the keys"?
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