Now that i've debunked the cheesing argument I will say a limit on short rests would be good. I feel 2 however isn't suitable. I feel like this means warlock cant really fit into a 4-man party. Their lack of spell slots coupled with lack of spell diversity makes them unsuitable to be a main caster and with only 4 people you need a main caster. As such with only 4 character slots, a limit of 2 makes warlock a vastly inferior pick for your arcane character. With Wyll being one of the more interesting companions this would be a real shame, although my personal preference to play warlock makes him an unlikely choice for me anyway.
