On Thursday, May 16, 2019 at 2:08:10 PM UTC-7, wrote:
On Thursday, May 16, 2019 at 12:48:55 PM UTC-4, Jj wrote:
Changing the length of cables is far from questioning the manufacturers design. It is altering it without acceptable or approved data.

It's actually not all that critical in this type of installation. Many ships have provisions for such an adjustment. Cable tension, which is part of the flutter prevention element, is done by the springs that pull directly on the pedals.
FWIW
UH

Looked at this while inspecting the Duo (original, same fuselage as Janus Ce) rudder cables in the shop. It would definitely make the back seat more comfortable.
Full rudder deflection and "feet off" cable tension would be unaffected, but the tension springs may rub on the composite spring covers after adding a link.
Jim