In http://typedrawers.com/discussion/1111/fontforge-harmonizer Michael Vokits said,

As for FF, the only feature I think it actually lacks is the ability to always show node positions, and that's purely a preference thing (it's a real drag having to go to the View menu over and over).

Similar to 'Show All Control Points', this means:

• Add a checkmark menu item to Char View, View menu, Show, Show All Point Co-Ordinates
• Add a preference

When active, it would look like this FontLab screenshot:

or this RoboFont screenshot (thanks to Nina Stössinger for posting it in the TD thread above :)

However both show failure where points are close together. So a bonus task would be

• like the Ruler tool, use some 'collision detection' to avoid overlapping co-ordinates