Suggestion 1, sticky menu and defaults:
Some times you need to search through several menues, jump between different dwarfs and so on for different reason. Being able to toggle menues to be "sticky" ie don't reset would be really nice as well as customize their defaults. Ie always sorted in the same way or always sticky and similar.
At least for me being able to toggle a list to be sticky would make squad assignment much smoother and somewhat ease the burdens of the justice system.
Suggestions 2, better places UI;
Be able to filter, group and see more information in the places tab. Being able to add custom tags/labels to zones would be nice but just having my bedrooms and tombs etc grouped up and able to sort them would make life easier. It would make it simpler to see current status of your room stock and if you could group zones it would be really nice. Ie, tis bedroom, tomb, office and dinner is one group so I just assign the noble to the group instead of each one manually.
Also being able to see room value would be really really nice so you know which rooms are the best ones and which ones needs more tlc and so on or for nobles, how much more value you need to add.
Suggestion 3, dwarf information:
One could probably come up with many different types of information different people would like easily accessible and allowing that would be golden but for now I'll start with one simple request. I want a number for how many dwarfs currently lack a bed. Would really help determining how many more rooms are needed.
Suggestion 4, route handling:
When adding stops to a route, either hoghlighting the stop when hovering over one or adding a button that zooms you to a stop would make it easier to deal with routes.