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More experience from spell learning
Honestly, I always thought that 10 experience points per spell level was pretty much entirely irrelevant and pointless: in Baldur's Gate 2 the 1000xlevel points you got could stack up into some pretty good numbers later on, but the equivalent BG1 number is far too little to amount to anything at all, even if I taught every spell ever to my mages.
50xlevel, I feel, would be the bare minimum, although I do think 100 points wouldn't be that bad either.