I´ve got the same need, did you find any good solution for this?
I´m looking for a macro or something to solve it, but nothing found yet.
Yes they can.
Maybe not automatically, but you can have tolerances on by default.
And you can set a different tolerance for each TYPE (Angle, linear, diameter, etc...) of dimension as well.
EDIT: In order to add this functionality to your drawings from here on, you would have to update your drawing templates.