Go go Gadget suggestions!
1. Ground unit organization is cumbersome. While it's better than 5.00 (or was that 4.9x I first tried?), since the "select an HQ unit" dropbox no longer resets immediately after assigning a unit to one, it still needs help. It'd be nice if we could select multiple units and attempt to assign them to an HQ (or transfer them to a pop/PDC or whatever) all at once. It'd also be nice if full HQ units (i.e. those which already have 4 units assigned to them) were either visibly flagged (an asterisk, maybe?) or removed from the dropbox.
2. As an alternative to the above, or more likely in addition to it, perhaps an "automatic organization" button is in order. It could place as many unassigned units as possible under non-full HQs. Ideally, it would only make homogeneous divisions (e.g. marine-only or garrison-only).
3. We need some way to add multiple slipways at once, whether it be an "add X slipways" order or a shipyard order queue. I find it tedious to babysit a brand new shipyard (thus 1 slipway) on its way to, say, 10 slipways for FAC production.
4. I like elite crewmen a bit too much. I've set my racial training level to 125 for two reasons: it gives a crew grade bonus slightly in excess of 100% and it yields a nice round 8 crew per academy per year compared to level 121. To compensate, I've built way too many academies, 1250 to be precise (obscene amounts of minerals in the process), thus getting as many crew per year as someone with base level training and 10 academies. The problem: Too many officers. I now have several thousand officers (far too many to spend several real days retiring individually), which bogs the game down horribly (minutes per time increment instead than seconds), most of whom are superfluous. There should be a way to reduce officer bloat (and no, Replace All is ineffective when I get some 6000 officers per year). A "maximum officer count" setting (preferably on a per type basis, so we can say "allow only 100 scientists but up to 1000 naval officers" or whatever) would help, as would a "retire 50% of unassigned officers" button. Those are the first ideas that came to mind.
To summarize that last one: If you invest a lot of time and resources into academies because you want awesome crewmen, you will get redacted by useless bums (read: officers) who mostly do nothing but slow the game horribly. We need some means of controlling the officer bloat while reaping the benefit of our investment in crew training.