1.  Say I'm buying it for Sight Group and Normal Hearing.  What's the range...200m or 250m?  Adders don't improve the range, but an extra sense or sense group is NOT listed as an adder in that section (6E1 page 180).

 

2.  MegaScale obviously applies to the range of the power.  If I purchase Mobile Perception Point, does it apply to the perception point movement rate?

1.  250m.  The costs for the Clairsentience working with Senses beyond the first, and for whether or not it works Pre- or Retrocognitively, are included in its Base Points. Those are not considered Adders.

 

2. No, because the speed of the mobile perception point is not connected in any way to the range of the power.  There's no reason to think that MegaRange on Clairsentience would speed up the mobile perception point. So you could place the perception point at the (now very distant) range, but moving it around at that location would still be at 12m per Phase.

 

If desired, you could buy MegaScale on the Clairsentience again, this time as MegaMovement for the mobile perception point. However, that would make moving the perception point a Full Phase Action (as with any other MegaMovement), instead of a Half-Phase Action.