Yes, a directory of businesses accepting NIM that appear listed on a map with support for nearby searches would be very useful. There is also a couple of WordPress plugins that I’ve tried out but in the free version there were limitations like not being able to do geo location searches, so an open source platform like Coinmap would be very welcome.
I’ve also thought that, in the future, a platform like localbitcoins for Nimiq could be used in places with no support for Fastspot/Nimiq OASIS, and it would be a complement for the directory of businesses. Those very same businesses could be using the platform for converting Nimiq to the local currency. I’ve searched for plugins or open source platforms with no luck though, so something like that would need to be built from scratch. Eventually there is a chance than when Nimiq reaches a high volume of transactions worldwide, it would be listed on some peer-to-peer platform like localcryptos, so there is also that.