From just browsing common/ruletypes.h it looks like the rule Character:SkillUpModifier may do what you want.
The default is 100 (it is a percentage, so 100% = 'normal rate'). Changing it to 200 should make skills go up twice as fast (technically it would double your chance of getting a skillup each time you use the skill). You would update this in your rule_values table.
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