Evasion, a large save bonus against your own bombs, and not failing on 1s vs their own bombs?
Well, they already get Evasion, and eventually Improved Evasion. Those were meant to achieve the primary goal. They also get good Reflex saves, and Dex is a secondary stat. To be honest, no Saboteur worth his salt should be taking damage from a bomb.
Futhermore, Precision Bombing and the improved version allows them to leave squares, and thus themselves, out of the blast. Lucky Break, one of the Least bright ideas, gives a significant boon to saves (starting out, likely, as roughly equivalent to the save-boosting feats, but growing in strength and utility later on). Eventually the Saboteur could swap the save bonus to Reflex as a reaction, so they really ought not to take any damage from a bomb past level 9, with an almost certainty at 13.