When displaying in inches, the dimension lines only resolve one decimal place.
Common US measurements use 1/8", 1/16", and even 1/32" accuracy, which can't be
conveyed with only 1 decimal place. 

The best solution would be to allow fractional representation of values, as that
is what most users would use, both professionally and for
hobby/repair/renovation projects. Decimal is usually only used for mechanical
design work, and that is normally with three decimal places.

And when the units are set to feet, the common breakdown is feet-inches -
fractional inches. Draw only resolves to 10ths of a foot, which is rarely practical.

Alternatively, giving users the option to select the number of decimal places
would be a big improvement over 10ths of an inch. We normally can convert at
least to 1/8" increments in our heads, and smaller increments using charts.

This would open an entirely new set of users to Draw - architects, woodworkers,
cabinet-makers, and blacksmiths (that's me :=).