I'd like to see enhancements for rogues, like faster sneaking, but for search and disable device.
Once you know a quest and all the traps in there it would be great if the searching and disabling would take less time,
so getting those 15% trap xp won't slow the party down and won't distract the rogue from his main job,
stabbing pointy stuff into kidneys until everything is dead.
Every tier could shorten the search and disable time by 10%, for the cost of 1,2,3 and 4 AP.
Another way to implement this would require linking the enhancements with the skills,
e.g for every tier you shorten the search and disable time by 0,25% per rank.