Just for shits and giggles - what kinds of numbers would you like to see found?
I'll go first. I'd like to see some phone patch that lets you listen to a shortwave receiver. And set it to any frequency you want. Oh! And it should be connected to one of those ridiculously huge antennas, like the ones that're four or five stories tall too.
Other then that, some internal test line that lets you set ISUP fields would be pretty cool.