WOW!
I just run the new installer and the hostname bit was fixed and I like the option for the swap partition but I smiled when it came up and asked me which swap partition to use sda1 or sdb1, that was class Sir, I used an installer recently that added both swaps to my fstab.
For the first time I told it not to write grub when I installed on sdb5, I normally use the MBR option, so I booted into sdb2 and run update-grub but when I rebooted I had 5 lines in grub for sdb5.
I reinstalled and selected MBR and everything was good, tomorrow I'll do the install again without selecting MBR to see if it was a one off or if I can replicate the multi line grub.
Regarding unionfs in Solus I think it will be discontinued shortly as Ikey made this post
http://main.solusos.com/content.php?140-1-3-IssuesHis 1.3 Squeeze update is due out this week or next and I'll see how the snapshot/installer goes on that one.
I love your installer, I think it's the best I've used, thank you for your time all concerned.

PS.
There was one thing
Folk snapshotting/installing other distros might find a bit odd and that's the option to edit visudo.
Since I first come across the line you add to visudo I have automatically added it to all my installed OS's but in other distros that line won't exist to edit.