When using the mouse for a long time my arm gets tired. So I like to alternate between the mouse and the keyboard. The arrow keys work very well for navigating around SudoCue and the Helper, but when I reach for the numeric keypad to insert the number I want, I sometimes hit the wrong key. I would like to be able to hit Enter, one of the biggest keys on my keyboard, when it is obvious which number should be inserted.
It took a while to get used to it, but I now use SudoCue more often than Simple Sudoku. If you add the three features I miss from SS: the ability to highlight pairs, more readable candidates and Enter key support, your software really will be better in every way.

Many thanks,
Brian.