I home mix agfa 100, which is close to a clone of the published home mix dektol/d-72 formula. I use washing soda from the grocery store laundry aisle as my source of alkali, but it does give the prints a bit of a perfumed scent, if you smell them carefully once dried. I find it keeps well for 5-6 months or more once mixed, and is vialble 1:2 for a few days if it is poured into a near full glass jug and capped up overnight.
I don't see a whole lot of tone varaition with RC from deevloper, so I don't get too fancy with them. FB is another story however...