I recently aquired a feral hive that is the gentelest I have ever seen
First of all, you have only seen a few traits for a very short period of time, I would hesitate to jump to conclusions by such a short observance.
The only negative factor I see is your geographic location. Unfortunately you can not control the queen possibly mating with AHB drones in your area. You can only control half the equation, and even that half has not yet proven all it's good qualities.
Ok, so you have seen the gentleness expressed by this colony, but have you seen it's ability to produce an abundance of honey? What about it's propolis production, swarming tendancies, wintering capabilities, spring build up, temperment during a dearth? Just a few things to consider.