more fx selection shortcuts

hi,

we currently have the choice of defining 3 fx as the 'most used' and access them through shift + any fx button.

this could be easily multiplied x2 by simply differentiating between when left shift or right shift is being used, i think it would be helpful to bring more effects to load instantly. 6 sounds good.

since when in a rush to get 'that' effect quickly, navigating through the list with the shift+fx on button is really painful, most of the times you pass the effect you were looking for and have to give another turn or pick the mouse and expand the list.

for the chained mode, there could be more shortcuts to pre-defined combinations as well, don't know exactly how to make these now but it would be useful to think about it.