Your comments

Sorry - I'm hardly an active enough user to be making badly worded suggestions.

I think I was using FTP through a shared folder in Finder. I don't recall what problems I was having though - sorry.

For multiple tab sets, I guess I'm talking about split windows. Like the "Split Pane" feature in in OSX Terminal (though in Terminal, both panes cannot have an individual tab set).

Regarding the colours - some form of automatic window colouring - even if it's just a setting that makes each new window have a different background colour. Or giving windows a tint or mark that makes each look unique - somehow - anyhow.