some UI needs are so hardware specific and also not the best choice for the majority of the users to build into products. when that occurs, no need to wait.
then go to http://192.168.8.1/cgi-bin/luci/admin/system/commands
and make a roaming, no roaming script or set provider script etc. then bookmark in your browser.
From a business sense some of it also comes down to how many people want this functionality? I for one don’t need this functionality (please note I’m not saying that your need is “wrong” ) . How much time do you spend (and pay people for) to add this functionality to the Gl.Inet UI?. Yes it can be done via Luci, but I agree with you that things in the gl.inet interface are so much easier (I’m still having issues with trying to get a USB stick working on another OpenWRT router, Gl.iNet…plug it in and it works).
Another factor, would they have to increase the price of the Mudi to pay for the work to add the additional functionality?