What other mods are compatible?
DeaconIvory made a list of popular mods and how compatible they are with long war. You can find that list here
Adding more turns to the mission timers
Per the developer Amineri:
As for the timers, if you look in the config file XComLW_Overhaul, there is a difficulty-specific modifier for timers :
TimerDifficultyMod=4; Rookie TimerDifficultyMod=1; Veteran TimerDifficultyMod=0; Commander TimerDifficultyMod=0; Legendary
Thus, 4 turns are added to timers on Rookie, 1 on Veteran. Modifying these can add turns.