HI,
1. we never could manage to priorize the connections in our order (1 WAN, 2 WIFI, 3 LTE), it seems always to jum to LTE and dismiss WiFi
Can you add a screenshot with your settings?
Which firmware release version you are using?
2. any chance to make WiFi users or non registered users acess ONLY the internal network, so no 4G routing (no WWW)
It is not so easy , but you could try to make this via Firewall rules. You will need set IPs or MAC for allowing/blocking.
3. where can i get more info/pricing about the RMS, i asked sever times via Email, but never got an aswer in the last 24 month
Contact with person from which you buy your routers.