i have not personnally dont it but i have read a bit on eople that have dont it.. and the do it for the exact reason you stated... seems like it would work but thats just an extra step for me to do... and i woulnt trust the consistancy too much... as you might not put exactly the same or right portion as the lst time.. thus making me test the water everytime... but it do seem very plausible...
YzGyz