Might as well ;)
+ Suggestion: use the Chip Color as the background in the chip menu at the bottom.
+ Suggestion: Home and End key support on text inputs (bonus CTRL+ARROW too?)
+ Suggestion: as OP's initial idea, some kind of "Constant" that exists inside the chip, but doesn't create an input for that chip, but as a revision to the suggestion: Let it be a dipswitch :)
+ Suggestion: Preset Color Swatches for Chip Color for quick assignment - I'd suggest using the same presets that one finds in pins?