I have been wondering the same thing, Buck91. I got a L1T v2.0 for my mom and I really like it on NiMh. If it will run safely on a 14500, it could be phenomenal!
I've used 3.2v rcr123a cells in my L123T for an age with no problems. I've seen LiFePO 14500 cells online for reasonable amounts, but they also need a charger designed for them. Worthwhile if you want to preserve the levels.