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I have run some tests on Keen and Quing, in the context of the normal FIDE
opening array. I always forget which is which, so I like to refer to the
piece that moves like a pedestrian, but kills at a distance (mKcQ) a
'Trapper', and the one that moves far, and then tramples around in
destruction (mQcK) a 'Tourist'. (The Knight-like counterparts of those
could then be 'Hunter' for mNcQ and 'Pegasus' for mQcN.)

One Trapper lightly beats the Bishop pair, perhaps by as much as a quarter
Pawn. With the Kaufman values B=325 and B-pair bonus = 50, this would give
Traper = 725.

Two Tourists beat R+N by at least half a Pawn (perhaps 75cP). With the
Kaufman values R=500 and N=325, this would make Tourist = 450. So it is
indeed clear that the extra captures make the piece much stronger than
having these same moves as non-captures.

This should be compared with the Commoner (opening) value, which is
slightly below that of a Knight (so ~300). Note there are clear non-linear
effects: adding the distant non-capture moves to the Commoner ups the value
from 300 to 450 (+150cP), while adding the same moves to the Trapper ups
the value from 725 to 950-975 (the Kaufman Q value), i.e. +225 to +250.