Yes, you do have a point. I'll see which solution seems more elegant.In this way, you will get multicast traffic only between vdsl and Raspberry, and not on the WLAN.
You have a 5 port router... Why use it as a 2 port router with a a switch ?
Where do I get the beta version? As far as I know it's only available as online beta testing?Try Mikrotik Hotspot manager beta...
ip firewall mangle> print
0 D in-interface=pppoe-tomi protocol=tcp tcp-options=syn-any
action=passthrough tcp-mss=1440
1 in-interface=pppoe-tomi protocol=tcp tcp-options=syn-any
action=passthrough tcp-mss=1360