Maybe we are getting to the stage here where we can't see the woods for the trees!
The FCOM now clearly states that if landing conf 3, then press the little button on the mcdu - even if only for consistency!
If Vapp has to be modified, then simply add the increment onto Vls config full which is available from the QRH which you will have out anyway at that stage.
Comments gratefully received.
Cheers,
mcdhu