Moving apps from SD to internal memory

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Is it possible? I'm using Mixzing as musicplayer and I'm experiencing some occasional stuttering. I suspect this has to do with Mixzing being located at the SD-card along with all the music and when it reads from the memorycard while playing it causes a conflict.
I've tried tons of ROMs (both on Desire and Hero) and I've had the same issue with them all (at least when using app2sd).

So can I move Mixzing from the ext3 partition to the internal memory somehow?

(Please move this thread if necessary)

I would love to know this too. Not that i need it, just feel like its something that's good to know, just in case.