Got this idea from the Artificer Mastery line of granted feats, and their application of retaining charges on items.
I think that at every third level, Rogues should be granted a feat called Tool Mastery. This would grant the Rogue the chance to not expend a tool when they disarm a trap or pick a lock. It could use the Rogue's Int bonus, level, and and either their Disable Device or Open Locks skill to boost the chances to retain the tool.