One of the things I spend a lot of time doing is designing (or redesigning) my ships. In the process of doing such; there are a few things that come to mind that would certainly save a lot of time and make things way easier:
1st (and foremost) among them would be the ability to swap out components. It would be fantastic if I could click on the component that I want to upgrade and have the new one placed in the exact same spot with the exact same settings!
2nd (and very much needed) would be + and - buttons above (or below) the Rotate Offset dials. There are so many times when I sit there going back and forth between 178 and 182 (and other close numbers) trying to get 180. Having those + and - buttons would allow me to simply click a few times to get that exact number I require.
3rd (as I haven't figured out how yet) is the ability to edit a template without creating a new one (and having ones I don't seem to be able to delete).
4th (and this is a biggie) would be the ability to copy an entire design (excluding components) from one size to another.
Last (but certainly not least) would be the ability to preselect a hard point (or soft point or whatever they are called now) prior to adding a new item. There are so many times when I can't quite get that new piece to go precisely where I want it.
Anyway, those are the four big things that I would like to see added.