That being said, I do need them for opening locks and dealing with traps. I've thought level 7 is a perfect time to dualclass a thief, since they can get OL and F/R T up to about 90 or higher, and they also gain evasion, a useful ability. My problem in my last game was dealing with those traps after my character had dualclassed out of the thief class, but had not yet gotten his thief skills back (essentially having no thief in the party, which sucks, just ask NobleNick!). So, for my new game, I plan on actually using two of them (weird, eh... read on!).
I plan on having two human characters start off as thieves. The first one will dual class into a cleric at thief level 3, 4 or 5, so that I will have my thief skills back before I even need them. They will be low level skills, but should be good enough for the early game (as I gain some experience with the IWD world, I'm starting to realize how good an essentially single classed cleric is as well, and a cleric with 3, 4 or 5 levels of thief won't be far behind a single classed cleric. There seem to be a lot of undead in this game, and my characters are always taking some damage!). I want to dual as early as possible, without really handicapping my team (either with lack of thief skills since this character will be the only one for a time, or with lack of spells and turning ability). Since my team will include a bard, I might just have him memorize a ton of knock spells and have this character maximize F/R Traps.
The second character will switch from thief to mage at level 8. I had originally thought level 7, but this shouldn't make a difference in the long run of things, and I'm pretty sure a thief gains an extra proficiency at level 8. I also don't think you really need a mage so much in this game, so I do not mind waiting a while longer for a spellchucker.
So far the party is like this:
Thief (3,4,5)>Cleric
Thief (8)>Mage (with ToTL a generalist is probably best... might go illusionist since the bard can pick up any restricted spells)
I'll definitely add in a paladin and a bard, two really fun, powerful classes. I'd also like a druid, but will go multiclass here. I think the party can use more tanks (it's too bad ironskin isn't a spell in this game). This leaves only one slot. As I said, I like tanks, and this party is lacking a pure-classed fighter. I'll probably insert a gnome fighter here, since I've always liked gnomes and they can use that awesome helmet from Khuldahar.
To summarize, I have:
Human Paladin
Half-Elf Fighter/Druid multiclass
Gnome Fighter (see below, might switch)
Human Thief(3,4,5)/Cleric dualclass
Human Thief(8)/Mage dualclass
Half-Elf Bard
Eventually, when both thieves have dualled completely (gaining back their thief abilities), I plan on having the cleric play just like a normal cleric, even wearing heavy armor (you can still search for traps, just not disarm them). The mage will be played just like any mage/thief, shooting arrows while not casting spells.
I would really appreciate responses and input on this party. I'm still pretty much a newb at this game, so please do not spoil me too much. I would really like input on the two thief idea, and what levels I should dualclass at. And please don't suggest to me that I should try backstabbing and sneaking around, it doesn't appeal to me.
Thanks a lot everyone, for both your input and reading through my babbling post (I hope it isn't too bad!).
Would I be better off replacing that gnome fighter with a second paladin? I guess it comes down to what is better: draw upon holy might boosting awesome stats or grandmastery in greatswords...??