Can I configure Softkick to boot 1.3 ROMS by selecting the 1.3 partition in boot? Will that make it have to reboot and reselect the part again?
Nope. You'll lose access to both the menu, and probably your HD, because you will have just kicked a 1.3 ROM image onto an A1200. ;-) Remember, when you kick a ROM image, you only have the functionality of that ROM image available. There never was a 1.3 for A1200, therefore you lose the A1200 features, such as the IDE controller, the PCMCIA port, etc. The Blizzard SCSI MAY still work, if you have that. I doubt it, though. I've never heard of anyone trying it. In fact, the 1.3 ROM may not work at all on a BlizzardPPC.
What about BlizKick since I have a BlizzardPPC? Does it work any better then softkick?
I don't think BlizKick can kick anything below a 3.0 image, can it?