Is there any way of: c) printing EVERY line number instead of every tenth line number?
(C) is the most important for me.
I've found that the lower stitch count 32x32 stitches does allow for the printing of all numbers, so that's something at least.
For why I need these features: I am designing Corner-to-corner (C2C) crochet patterns. These are read along the diagonal not the row or column, thusly I need to see line numbers along all sides to match along those diagonals.
------------- Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?
I don't think your other items are within the scope of the settings so cannot be changed by you. A future version might address these issues.
As for what you noted with the 32 ct designs - remember that the scale you define is really just for show.
Even if used the way it's intended (for counted cross-stitch), you can use any fabric for any defined scale pattern with absolutely no change in the pattern. The only changes that occur if you use a 14 count pattern with 32 count fabric (or vice versa) is the SIZE of the result and the amount of floss needed! Really!!
Since the floss usage isn't that accurate anyway, I always tell new users to design using a scale that makes the design look right for you on the screen. There is a visible difference during design - the finer the scale, the smaller the visible squares.
You can always say to use the size fabric you wish but it is intended to be stitched on "x" count fabric.