Dear Helbi,
I own Genos and a CVP 309 in a beautiful Polished Ebony finish, both located in my big living room, plenty of antique furniture, nice paintings, Persian carpets, ecc.
Nevertheless I have the expression pedal plugged into the Clavinova. It is a small addition that aesthetically disappears among so many other things. But UNDER the practical/musical point of view changes strongly your interface with the Clavinova, allowing controls that could never be achieved without the pedal.
The expression pedal can be free assigned to any of the Left, R1, R2 (in the 900 series I believe also R3) voices, and is so useful not only for pads/organs, but also for solo instruments as saxes, guitars, human voices, ecc.
It allows a much more realistic performance, and I would kindly recommend to use it: I cannot do without it.
Ciao
Angelo