I'm still using 4SQ, and I'm glad I added a few of my regular spots in 4SQ... Because when I am configurating Waze to choose a destination, and I use the 'search' option, I see myself gliding one step to the left to the '4SQ' option, almost EVERY time... and what shows up: my known check-in points from 4SQ !!
SO EASY !! All my favourite spots (or a lot of them), easily accessible, easily addable... also the locations where I don't come that often... If I've been there, there is usually a FSQ check-in registrated, and those check-in points are exact locations for Waze (better than the street and housenumber), because 4SQ allowed me to locate (or correct) the exact location on a map... the Waze App has become more useful for me since I discovered that option (because the destination is exactly correct, not roughly estimated)
so I vote for an easily accessible 4SQ-button - 4SQ made Waze better than it allready is, so why not return a favor?