I wasn't using iReboot at all.
Since building my latest UEFI/GPT SSD PC, my former HnS grub quad-boot became a straight W7/W8 dual (99% W7) so I hardly actually multi-booted at all.
After adding W10 it became 98% W7, with occasional monthly boots into the metro world just to keep the patches and new builds current, but doubling that maintenance load made me hanker for the old "default to the current system" I had on the quad boot, as I had to sit around waiting for the reboots to jump in on the arrow key.
When I saw the iReboot 2 announcement, I thought I'd bang it on and start using that instead.
I couldn't remember what config parameters did what exactly, so I thought it would be good to ask in the public forum, so it's there as a reference for others too.
Incidentally Peter, If your error message relates to updating the config file, you'll need to grant yourself permission to update it. By default it objects.
CG, I had correctly guessed (remembered?) version 1, but have not tested it yet.