.. I haven't found a way to do that, but I have just thought of a better method than the one I was using (for me anyway) so I thought I would share it with you:
Record each take as normal and press stop when finished. To get ready for the next take, simply drag the clip and drop it after the end of the song.. when you come to audition your takes, select the top one (from the random pile of stacked clips you have probably ended up with), drag it to a fresh track if needed, and r-click -> 'set start time to original start time of source BWAV'.
You can then edit out the bits you don't want / delete the duff take and repeat for the next clip.. I found it very fast and easy even with a Les Paul slung round my neck!

