I cant see how allowing you to downshift would be any different to what you can currently do, I managed to go from the top end of 4th gear to 3rd in a 172 years ago instead of 5th.
however of course it would be a good safe gaurd to prevent the gearbox from doing this as all its going to do is prevent you from blowing the engine, not going to affect the driving experience in any way!
you said the gearbox will change up on its own, that it wont do.
The difference being of course that in a manual gearbox, the gear wont go in if you try to force it at an engine speed that is too high. In a sequential box or a box with an electronic sequential controller, the gear can be forced. In the former, the driver has to know when and how to effectively downshift, in the latter, the computer prevents the gear going in by overriding the command.
Driving along at 70 in the new rs and you suddenly click downchange 5 times. Do you honestly beleive it will go down 5 gears? No the computer with over ride and prevent a down change.
We know the computer will override commands, the golf dsg box does this all the time. When you drive up to a junction and stop it AUTOMATICALLY selects 1st. The rs box will be similar. The question is: will renault get the level of override right so that it doesnt feel intrusive?