One thing to consider on that drawing is that the additional receptacle is also drawing on the same 10a fuse, limiting TOTAL current to 10 amps. Feeding the extra receptacle directly from the incoming hot lead would leave the full 10 amps for the hot/cold controlled circuits, and the 15a (or 20 as applicable) breaker in your house panel would provide the overall limit.
Absolutely right, thanks for pointing that out! My primary use for it is a stir plate. Keep the total draw low.