Please, please, please, a udpxy module to augment the multicast module?? Multicast TV is effectively useless over WiFi links because WiFi shifts to its slowest (and most noise-immune) speed for broadcast-like packets. Besides that, experience indicates that Windows 10 can be fragile in the multicast area. And LAN switches (including my TP-Link SG-3424's) don't always do IGMP snooping correctly, especially for edge cases.
Yes, it's possible to put a wired Linux box on the LAN and do upd multicast - to - http unicast proxying there, but it seems exactly the sort of thing a router could do well and inexpensively. If MikrotTik would implement udpxy, IPTV ISP's (like mine, init7.net) might start preferring MikroTik routers for their clients, don't you think?