I think that's what the account data table is for:
CREATE TABLE IF NOT EXISTS `account_data` (`account_id` INT(11) UNSIGNED NOT NULL DEFAULT '0',`bank_vault` INT(11) UNSIGNED NOT NULL DEFAULT '0',`base_exp` TINYINT( 4 ) UNSIGNED NOT NULL DEFAULT '100',`base_drop` TINYINT( 4 ) UNSIGNED NOT NULL DEFAULT '100',`base_death` TINYINT( 4 ) UNSIGNED NOT NULL DEFAULT '100',PRIMARY KEY (`account_id`)) ENGINE=MyISAM;
It's made for accounts, but I think you can cheat it by setting the exp, drop and death from 100 (regular, no modification) to others.