I would appreciate if could be easier to recognize the active tab or some group of tabs. For example an option to set any new tabs with different background color or if there are 10 tabs and 3 of them connect to the same remote host got the same background color. Maybe it would be also help if using "copy input" to 3 other tabs (blue) and another tab copied to 2 other tabs (yellow) could be simple recognize with background colors (1+3 blue and 1+2 yellow tab).
Reported as bug 330556.