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The idea sounds great. I have a question though (and two suggestions.)

The question is : During a Fission move, for example, when the Nightrider
moves away from the Rook+Nightrider, is it limited to a single step ?

Update: I looked at the position you posted and found my answer, but is the position legal?

(After reconsidering, Black's last move was probably Rxb7 +.)

The two suggestions :

1. Replace the Nightrider with a Rose. The Rose strikes me, personally, as
a more natural extension of the Knight.

2. Compounds of two pieces, instead of being restricted to one step, they
can be absolute halflings. This has two implications :
  a. a Halfling Rose is not how Betza defines it, but rather how he
     defines normal halflings. If the Rose, along its normal line of
     movement, must stop at a certain square (because of edges or
     because of itself, not counting other pieces,) then a Halfling
     Rose moves half that distance rounded up.
  b. a King may not be involved in triple combounds. Double compounds
     are okay. (Retaining some of Fusion Chess's flavour.)