You know what. I've suggested this so many years ago, and I really do feel it would be a beneficial feature to mIRC and the Internet as a whole:
Allow mIRC to also support connecting to MUD servers and other Multi-User Dungeons (MUCK,MUSH,MOO,etc) that are based on plain telnet protocol.
Yes, this can be done via a script, though painfully and only with aid of spaces.dll and other hacks. Sometimes you can connect to a MU* server with a hand crafted DCC CHAT ctcp. But honestly, neither of these solutions are ideal.
Amazingly, Multi-User Dungeons, like IRC, have existed and thrived since the earliest incarnations of the Internet. They are in no threat of disappearing, but they could use the aid of a quality Windows client like mIRC. The other MU* clients out there haven't been updated in years or a decade.
I really enjoy IRC, but it lacks a certain flavor. I really love MUDs, but they lack a quality client.
Please consider a simple means of connecting to MUDs with mIRC.
Example: /telnet 126.96.36.199 4000