Allow to use the buttons when an item is selected (for all buttons except "Unload" button), it's already possible with the "Scroll Right" button.
When there is a lot of items in the Skyranger (more than one "Ground Page" needed), don't reset the Ground Page to "Ground Page 00" when changing soldier (Ground Page 00, Ground Page 01, etc.), thus the player don't need to always change the page to reach a specific item in the "Ground Page 01" (or "Ground Page 02, etc.) when he change soldier.
Also, why not automatically select the last item selected when equipping soldier (select Grenade, move it to a soldier free slot, Grenade already selected for next action), and simply left click on the ground area (an item selected) to move the item to the Ground Page without the need to move it on a free slot or on a corresponding item (Laser Pistol over free slots, or Laser Pistol over Laser Pistol) .
*
The addition of "Copy" and "Paste" buttons is really great.
It can be enhanced further for less need of clicking, especially with lot of soldiers in Avenger.
Different ways to do this:
Make the "Past" button a 4 states button (visual change for the button), right click to change the state and action, "Paste Template" (current), "Paste Template to all Soldiers", "Paste Template only in free slots", "Paste Template only in free slots to all Soldiers".
(complicated, but less visual intrusion, use of mouse only)
"Paste Template only in free slots": paste the items only in the soldier free slots, items already in corresponding slots remain unchanged.
"Paste Template only in free slots to all Soldiers": same as previous but for all soldiers at the same time.
Add two 2 states button (on, off) near the "Past" button (poorly done in image), one button for "Past to all Soldiers" (on, off), one button for "Past only in free slots" (on, off).
(easy to use, but more visual intrusion, use of mouse only)
Use CTRL + mouse left click to paste the same template to all soldiers.
(less visual intrusion, use of keyboard needed, use of mouse needed)
Use ALT + mouse left click to paste the same template, only in free slots, to all soldiers.
(less visual intrusion, use of keyboard needed, use of mouse needed)
Use ALT GR + mouse left click to paste the same template, only in free slots, only to current soldier.
(less visual intrusion, use of keyboard needed, use of mouse needed)
As usual, the images are for explanation only.