Here's one that I don't think has been mentioned yet.

If one goes to the option menu of the game under the battle section of the controls section there is a fairly extensive list of shortcut key commands for the battle screens.

Many of these are duplicates of functions performed by various buttons included on the full user interface of the battle screen in both land and sea battles.

Examples would be "[" & "]" (left and right bracket keys) equate to decrease or increase sails respectively when playing a sea battle.

In land battles these same two keys equate to increase rank or increase file respectively which also duplicate on-screen buttons of the full battle user interface

There are other keyboard commands that allow one to rotate their entire army or any unit on a center axis plus move them backward or forward by short increments, which are also duplicates of on screen buttons in the full UI.

All the keyboard commands work when one is using the full UI giving one two methods of performing the listed functions. However, when one switches to the minimal UI, the on-screen buttons for these functions are not included. but oddly the duplicate keyboard commands also cease to function making them sort of pointless.

I prefer the minimal UI when in battle, but feel a bit hamstrung because of the loss of these functions.

I cannot imagine that this is what the developers intended and it should be corrected in a future patch.