Overall,
1) MCP is slow to start and does not keep-up with a fast Typer.
2) I would not use a light blue background, it makes it hard to see some on the smaller characters.
Operators and Symbols Ribbon
When you Hoover over a character, it would be nice to see a bigger view of it along with its description.
Zooming
Incorporate a zooming function = Ctrl+ mouse 3
Long Ribbon sub-menu list
I would create some blocked values (H-N) at the top along with the first 10-15 items, so a user is not scrolling through the list to get to the w's
Jon