I often use about 6 ptys for my work. I don't use
mlterm because
I don't see which pty I have selected. There may be
(switchable) some tabbar, with pty numbers (or pty
titles, see title request),
to get easily oriented which pty I use.
Activity monitor would be also nice (eg. changing color
of tab).
I.e. multi-gnome-terminal has red color for active pty,
black for
passive pty and blue for unseen activity on passive pty.