I chop up my samples and add my markers with acid. Save the wavs and then import them into FL. Also, sometimes I like to export my drum track only as a wav. Open it in acid and play with additional samples and make em fit to the drum track. The reason...none, it's just fun to work with.
I drop marker on wavs with soundforge, then load the whole wav in FL slicer and all the markers are still there and slices automaticly assigned...its such a cake lol!