It would be cool, if - in newspeak the gui - the interface was, where the mouse is. There are games already using this technique and it facilitates things a lot. You don't have to spent a lot of time on searching submenus, but can keep looking what happens while you are doing, what you are doing...

Some statistic functions would be ok too. So sometimes it is much easier to look on a central spot, how youre stocks are doing and not remembering which house bears this information. Generally spoken, a "GUI" with little exceptions isnīt that bad.

what SH in general lacked was keyboard shortcuts for commands, especially sometimes it was hard to click the stop button...

it could be done for buildings (for building them)