There are a few things I really miss or find quite annoying when copying Bitmaps from Photoshop to Flash.
Life could be so much easier, but well, as so often, it isn't, because:
Is there at least an option to turn-of the DPI-conversion for single Bitmaps?
I think otherwise the DPI settings for the flash document and the settings in the PSD document should match. But that would be really tedious.
I always use a freeware program like irfanview to lose the extra DPI information which is just a big annoyance in many situations.
Well, that's about it