So as per the title really.
I think it would be neat if we could actually manage the VPN settings from within the mobile app.
Things like being able to change proxy mode, being able to view, add / remove clients from policy based rules list etc, so an option to quickly add a client to the VPN policy list by clicking on the client under "Connected clients" (where the settings are to block, rename - there would be a toggle to use VPN policy based rule list - default toggle off)
On the web GUI side I would also like the ability to be able to click the 3 dots of a client from the clients list and depending if the policy based VPN rule is enabled then there would be an option to "add client to VPN policy based rule list" a bit like when you have hardware acceleration enabled you get the option to modify speed but if hardware acceleration is disabled that option isn't available. So the check for having the option would be if policy based rules are enabled.
This next suggestion would apply both gui and mobile app.
A little light indicator beside each client (on the web GUI clients list which would also appear on the connect clients list on the mobile app) that is using policy based routing to easily distinguish which client is getting routed without going via the list again to check.