Hi Chipp, yes the same thing should apply to the Copy, Paste, and History icons (info on this here: http://moi3d.com/forum/index.php?webtag=MOI&msg=6325.5).

If you place files named CopyClipboardIcon.png, PasteIcon.png, and HistoryIcon.png in the /icons sub-folder they should get picked up and used without needing to change the side pane code itself.

To see which specific name to use (like you probably got tripped up because Copy needs to be "CopyClipboard", the other kind of copy is the Transform > Copy command), look at the button code to see what is used there for the res:// protocol, like for example for Edit > Copy it says: icon="res://copyclipboardicon"

- Michael