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Thanks guys. I'm pretty sure that Southco means it when they place that spec. The need is 50 ms maximum and a 450 ms minimum time between pulses. 

A relay can have an effective delay of 100ms while it is moving to make contact. That's twice as long as the spec. Any change should observe the maximum spec. Therefore a relay is out. The microswitch is activated after the motor has already moved the gear, so there is delay there, but not too bad. All that delay would have to be meaaured. And after that there would be variation because of mechanics, etc. If work goes into it, it should meet the goal. For me, a one shot does it because it controls how long the pulse lasts and when it can re-trigger. 

So the one shot would be "armed" and ready to fire a 50ms pulse (or shorter) at all times while the handle is released. Once the handle is picked, the pulse happens and will not be allowed again until the 12 volts goes away.... usually by letting go of the handle. One pulse only. And 50ms long. Want another pulse? let the handle go and pull it again. Like a semi-auto rifle. One bullet per pull. 

Newell service techs told me they've never used any wires from the latch besides the ones to activate the release. 

I don't think the one shot is over complicated. They use mercury switches in the doors to tell if a bay door is open. One of the uses is to disable slideout movement.

I suspect you are on to something. I was looking for more info on that latch and could only find newer latches by Southco. The new ones lend a clue that they are designed to be operated by an electronic device to actuate them, so one would assume it has the one shot type of pulse output you speak of. Seems that the microswitch is really only there to confirm the position of the latch as a feedback or could be used for other purposes. They do mention a microprocessor but not sure where it’s located, and this may only be on the newer latches I was looking at.