I'm not on a windows machine right now, but in the encoder preferences, there's a way to select an external decoder. Select that option and it'll let you enter a command-line encoder. You should be able to enter something like "c:\path\to\lame.exe --preset standard" (you might have to specify some variable to be replaced, like "%s" or something, but I don't think so). It'll then pop up a DOS window for each encoding. It looks slightly untidy, but it works well.