I have some trouble believing that people have found Quickdraw to be such a problem in their campaigns that they have to limit it or watch its use.
As a feat, it is useful but only within a specific, limited range of circumstances and even then, it isn't a power feat like Quicker than the Eye, Expert Tactician, Knockdown, etc which rapidly get out of hand if the revised text of the feat isn't strictly enforced.
Most issues that could arise from quickdraw seem like they would be more appropriately dealt with by enforcing encumberance rules or placing some limit on the number of items which can readily be kept in sheathes/readily available.
Seriously, have any of you actually had problems stemming from the abuse of quickdraw?