Ah OK, need to adjust for overall pedestrian friendliness. 
Still, crossing:signals=yes is more or less equivalent to crossing=traffic_signals with respect to signalization, with a focus on the pedestrian rather than the road user. I take it you wouldn’t’ve used crossing=traffic_signals at any zebra crossing with a Belisha beacon. But if we were to deconstruct a prototypical zebra crossing to its physical characteristics, I’m pretty sure flashing_lights=* would be the most fitting existing key for the beacons.
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