Linked Directional sensors / range sensors

[Lurkily]

I'd love a sensor like the gravity sensor (Or a modification of it) that links it to a specific block. 

 

I would also like rangefingers - circular rather than a line, range to closest terrain, closest enemy, range to a specific block, range to the planet's center.  (Output when range is above a mark, and below a mark.)

 

In combination, this would let us create formation flyers.  And that would be awesome.

 

I don't think these would be overpowered - line sensors have specific uses that can't really be replaced by these.