Ok - I've read your origainal thread and thought that your spell selection looked fine. And I have never Solo'ed (and don't plan to)
1. Friends - as a solo I think you'll have plenty of gold so I don't think you need it.
Prot. from Petrification. - Yu're right it could be useful, but don't you get a save vs. spell to avoid the petrification
Shield - I don't think it works against traps (or wands) - just like wand of Cloudkill ignore MR.
5. Cone of Cold - I never use it, because it is far to dangerous in a party (mages at the back)
Spell Shield - I don't think you need it - it is one spell to counter one enemy spell - I think there are better/more necesarry lvl 5 spells
Febblemind - Haven't used it a lot - whenever I use such spells, I always seem to get xx saves vs. spell (even after using G. Malison or other similar spells)
8. Maze - It will help to (temporarily) remove one enemy in a group (f.x. the mage - leaving the non-magic users much more vunrable.
Prot. from Energy - Like Prot. f. Petrification (and all other Prot.-spells) it is useful, but I don't think it is essensial
9. Black Blade + shapeshift - since you intend to use both spells in combination with timestop, I would say go with shapeshift
Imprisonment - Like maze - but permanent. I don't know wether you get Xp or not. I don't use it - I want the loot
