Andúril’s five-click Momentary mode is awesome, especially because you can’t exit accidentally. I use it frequently on my Emisars and Q8s.
Last September, ToyKeeper added dual-switch support to Andúril. I’ve generally avoided dual-switch lights, but Andúril makes them awesome.
It’s been working great on my EagleEye X6R with a forward-clicky tailswitch and a TA driver piggybacked onto the stock driver PCB.
I hike with a floody headlamp on and a small thrower at the ready. Momentary is perfect for identifying trail markers, landmarks, and the sources of spooky noises. 
With two switches, momentary brightness can be adjusted on the fly instead of exiting momentary, changing the output level, and re-entering momentary.
Activating the tailswitch while holding the e-switch overrides memory and turns the light on in moon.