Hello,
 g0> What is your location?
Italy
 g0> The only one of those that is a BBS terminal is SyncTerm, so that is
 g0> your best bet.  I can't say why its not allowing cut and paste.  Perhaps
 g0> it disables it when the remote side can use mouse support?
I already use but not being able to copy and paste is really too uncomfortable,
in the end I always use gnome terminal.
 g0> In Mystic you can enable asking for a codepage on login and you can
 g0> select UTF-8 there or ASCII based on your terminal type.  Your terminal
 g0> encoding needs to match that of the BBS otherwise you're going to get
 g0> odd issues.
My Mystic local codepage is setted to UTF8 (as you can see on this link: https://postimg.cc/cggDqgSP) and I choose UTF8 when I connect (when he asks me) but ever strange symbols instead of accented words...

--- Mystic BBS v1.12 A48 (Linux/64)