Customize with colors different areas of the keyboard on the bottom of the player.
That way, if people wanted to, they could color-designate various instrument ranges' timbral qualities as a helpful guide while orchestrating. Think Arthur Lange's Spectratone Chart.
Could be pretty useful for folks who do VSL mockups they later have them played by a live orchestra.
Example:
You load up Synchronized Dimension Brass I, Trumpet I. On the keyboard at the bottom of the player, notes E3-A3 have a greyish tint. Notes Bb3-E4 have a brownish tint. F4-Bb4, redish. B5-F#5, orange. G5-B5, yellow. High C and up, white.
Though, I suppose that might conflict with the keyswitch color schemes... but maybe there's a way to implement? Little colored dots? Maybe?