Re: Ricing: Speaking only for myself, if I see my batter beginning to rice, I beat it into submission with my stick blender, which (so far) has always worked well for me.
Re: Volcanoes: Thankfully, this has never happened to me in all the years I've been soaping, but if it did, I think I'd try to scoop up the volcano-ing mess into a pot and stir it into submission, maybe adding a little water and possibly applying low heat if needed in order to keep it fluid enough to re-pour.
Re: Separating in the mold: I've never had this happen either (so far), but if it did, I think I'd either try stick blending right in the mold or else just dump it out into a pot and stick blend it into submission that way.
Re: Cracking from overheating: If I catch it in the act, I remove my mold to a cooler place and smooth the crack over with a wet (gloved) finger and then babysit it until it cools back down from gel, which has worked well for me in my 100% CO soaps, which are notorious for cracking on me. If I don't catch it in the act, then I either just plane the crack off or try to repair it by rubbing over it with the back of my fingernail. By the way- I found a good trick to prevent cracks from forming in my 100% CO soaps- by placing bubble wrap on top of my soap batter in the mold. Works every time (so far).
Re: Soap-on-a-stick: Emergency HP on the spot....or else I grate it up and use it as confetti decorations in other batches.
I have the effect of separatig when I use aritficial fragrances. Could someone explain me why? Thanks