Better keyboard control for %-input fields

The individual digits of the numbers in the input fields are not selectable.
You can’t select the “2” in “123”.
One should increase or decrease the values with the arrow keys. (plus 10 with shift)
The manual sliders are not precise enough.

Some drop down menus should be bigger.
Some menu items don’t fit and one can’t say what is selected.
for example Vignette (in German):
“Weißer Rahmen 1” and “Weißer Rahmen 2” are shortened to “Weißer Rahme…”
How can you tell the difference?
Why not use the whole width of the sliders?