There is an extra up/down button, between Menu/Exit and Info Guide, that is usually not programmed.
I've moved Guide to Prev - which also isn't used - and moved Info down to the Guide button.
Menu isn't needed for Sky.
So now the colours are Menu>Red, Up>Green, Down>Yellow, Info>Blue.
It's a very useful location for them, immediately above the navigation, volume up/down, and channel up/down section, and is actually more practical than the colour buttons on the Sky remote.
It sounds like a hassle, but it works in practice, so I'm happy with it - but dedicated colour buttons would be an improvement, without question.
I also agree that 6 Activities to each screen would be an improvement, but again it's easy to live with the current situation of switching between pages with the left and right cycling arrows.
As colour buttons are being used more now in the US, Logi have every incentive to make the improvements, but I don't see them issuing a new model so soon after the One.