You can use:
Code:
UPDATE rules_values SET rule_value = 7.5 WHERE rule_name = 'Character:ExpMultiplier';
If it doesn't exist, you have to create it first.
Code:
INSERT INTO rules_values (ruleset_id,rule_name,rule_value) values (0,'Character:ExpMultiplier',7.5);
The above sql will create a the rule as part of ruleset 0 (the default) and set it to 7.5 (7.5x exp, I assume). The value I have in mine is 0.6.
Actually, I have two DBs set up and I don't remember which was the backup. I think the newer PEQ db doesn't have those rules in by default, so I don't know what the default for exp multiplier is.