Considering that when the interface for the terminal was created it was all about being able to do everything and anything without breaking a sweat. Simple things like automatic source code highlighting, animated progress bars, being able to view (now common) files like pdf and jpeg that were not common back in the old days. Popup tab complete, I can't believe that that isn't standard on all terminals already (especially since tab complete is all about being lazy, a popup makes a lot of sense).
I'll download the source and poke around it later this evening (right now I need to work on my exam of implementing the go-back-n protocol).
Cheers and keep up the good work.
PS: RDF support would be great (since you have json). RDF is the standard for sharing data (often statistics) openly online, check out http://data.gov.uk/linked-data