[QUOTE=restless]Unfortunately it seemed a little inconvenient to rely on another character which brought Thief/Mage to mind. I dont have a whole lot of experience with multi class characters though, and i'm afraid it will never be as strong as a pure class(which isnt all-important to me, but i dont want a mainchar not pulling his/her weight). Thoughts?[/QUOTE]
If you play Throne of Bhaal, which has a higher experience cap and High Level Abilities, then multi-class characters are just as worthy and fun to play as dual-class characters. Personally, I prefer to play multi-class characters in Throne of Bhaal. However, dual-class characters have the advantage if you play Shadows of Amn but not Throne of Bhaal. If you search for previous message threads, you can find a couple of messages from me in which I made comparisons between a Berserker dualled to a Cleric and a multi-class Fighter/Cleric, and that should illustrate the difference for you.
[QUOTE=restless]On top of that, I want the character to be human, so I was wondering if rolling up a thief or a mage, and then using shadowkeeper to turn it into a thief/mage might somehow tell the game I am a different class/race than I am(such as, just as an example, being unable to gain the mage stronghold because the game see's me as a thief).[/QUOTE]
Dual-class characters have a special flag than cannot be altered with Shadowkeeper, as far as I know. It can be altered with Near Infinity, but I can't remember the process well enough to give you instructions. If you do a search in these forums, you might be able to find some instructions.
If you'd rather not use Near Infinity and you're willing to experiment, you might try rolling up a multi-class character and then changing it to a human and see if it continues to be a multi-class human character. There's a way to do it, but I can't remember exactly how I did it. Again, I once posted some instructions, and you might be able to find them if you do a search.
[QUOTE=restless]Then of course, last but not least, there is the issue of Thieves as a class. In my previous parties, they have all been lockpicking archers, which isnt how i want my main character to be, and the little I tried using Yoshimo backstabbing didnt really go too well(running far away from the battle, hitting stealth, coming back and then missing backstab - repeatedly - wasnt very fun). Am I missing something? Maybe a Bard would be better?
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Thieves have a poor THAC0, so even with an invisibility bonus, they can hardly ever hit their targets. A multi-class Fighter/Thief is much better at backstabbing. Thieves have high Dexterity, which confers a nice missile attack bonus, so they tend to better with ranged weapons than with melee weapons.
Bards cannot backstab, so I'm not sure exactly what you're asking, but they have the THAC0 of a Thief so they too have trouble hitting things, at least at lower levels. On the other hand, an 8th Level Blade can cast Melf's Minute Meteors, which is devastating (relatively speaking) when you combine it with Offensive Spin, and a 15th Level Blade is not too shabby.
Unfortunately, this game is mostly concerned with using swords, spells, and missile weapons to kill monsters, so there isn't really much for a Thief to do besides wield bows and pick locks, as you say. That's just the way it is. If you want to play a more interesting character, I suggest you play some sort of spellcaster.