I think acclimatisation is a no brainer if you can afford the time i.e. get out there a week before the race. Not sure that anything that can be done here in sauna's heat chambers etc will prove useful.
That is not to say running in heat to understand how you feel, your sweat rate what you like to drink and eat in thos conditions is not worthwhile, I see that as essential research, just not convinced anything other than being in the heat for a week really acclimatises you.
Foot wise I don't believe in the white spirit 'toughen em up' approach care and moisturise is the way for me the more supple they are the better they will cope in my opinion.
Hopefully see you at Badwater (he says quitely praying MRS S isn't listening) if you get there before me and need a pacer / crew i'm in!!!!!