A little out of left field...
I have read Barbarians of Lemuria a number of times over the past month. I may do a bit of a review here at some point.
This weekend I took my kids camping. I took along the 5.5E of Tunnels & Trolls and also the 6th edition. I have had a hankering for some T&T the last while.
Then I had a thought. One of the things I really like about Barbarians of Lemuria is its Traits (or Boons) and Flaws system. The core mechanic of BoL is 2d6 vs a target number. If you have a Boon that applies the roll becomes a 3d6 keep the high 2d6. For a Flaw you keep the low 2d6.
What if you took the same system and applied it to Tunnels & Trolls for Saving Rolls? For example, Ungar the Umbrageous, the level 1 rogue, has a Boon of "Sneaky". If Ungar had to make a saving roll for a situation where stealth was important he could roll 3d6 instead of 2d6 and keep whichever two dice he wanted - thus still being able to DARO (Doubles add and roll over).