Hey there,
any updates or new plans for allowing more simultaneously connections to peripherals? Last I found were up to 3 connections.. 
I used nrf52840 and nina b306 with NRF Tools, Softdevice 140 and could connect 8 in default setup and even 16 after some easy changes.. made no problems (only allowing a little less ram for the application)
nrf52840 and nina306 therefore supports up to 20 peripherals as a central and its the same chip used on e.g. the NanoSense..