Comment 22 for bug 370034

I've seen how the most widely used proprietary program works, and seems fine to me:
the ruler snap is set to the same visual guidelines of the ruler, that are every
2.5mm (you have 4 in every cm).
In the ruler you have the number, i.e. 3, then a small vertical line (at 3.25
position), a bigger vertical line (at 3.5 position), then a small one again (at
3.75 pos.) and the next number (i.e. 4)
Like:
...3--'--I--'--4--'--I--'--5...
This setup seems very reasonable to me, and needs not custom configurability.
In Draw is configurable but that is a drawing program, so you can have different
and special needs, while for writing letters the above visual snap is all what
you need. So better not bloat the config interface with another parameter to set
(and consider the support issues to those that have accidentally set it wrong...).