Just a thought/suggestion: might it be better if the keyboard commands were arranged by function rather than in the slightly random order they are at present? I think new players (who will obviously use this help facility most) will ask themselves 'How do I rotate this block?' or 'How do I make the grid smaller?' etc . So having something like...
Help: Construction Elements
Rotate:
To rotate an element use the direction keys UP/DOWN/LEFT/RIGHT/PGUP/PGDN
Resize:
To resize an element hold the [SHIFT[R] ] key and
To move or rotate the upper surface...
Mirror/Flip:
To mirror or flip an element...
Place:
To place a single element..
To place multiple elements...
Misc:
To active grid mode...
To change the grid size...
etc...
It might also help any colorblind players! The icing on the cake would be to have the bound keys displayed instead of just the defaults