[SixOfSpades]

aVENGER's Rogue Rebalancing mod and Weimer's Ease-of-Use both work along the lines you suggest, but in different ways.

Rogue Rebalancing makes Thieves more Thiefy, Bards more Bardy, and Rogues in general more useful to the party, where before they tended to be eclipsed by the Warriors and Wizards. It makes several changes to the Bard kits, most notably making the standard Bard Song actually do something (it was apparently never implemented properly before), removing all of their Trap HLAs and replacing them with spell-like abilities that fit well with the Bard's Ethos, each Bard kit has a different version of Enhanced Bard Song except the Blade, who gets a Weapons Display ability instead.

Ease-of-Use contains a component that "corrects" the way that the arcane spellcasting tables were "nerfed" by BioWare. Install it and Haer'Dalis will cast spells like Nalia, Nalia will cast spells like Edwin, and Edwin....don't ask. This happens because (I believe) the charts you mention are meant for 3rd Edition D&D. The game itself is based on 2nd Edition rules, with a few exceptions that didn't come along until 3rd Ed, such as Monks and Sorcerers. Weimer ascribes to the belief that bigger is better, which is probably why your party of 2nd Ed Warriors can't kill a 3rd Ed Improved Pit Fiend.