When writing in German, can it be made that it's case-sensitive?

[puffymuffy31]

Sometimes I forget when I'm typing formal you or a noun and Duolingo doesn't remind me (or make me incorrect) and says I'm right, but that certainly is a big no-no in German I assume?
Could it be made that it is case sensitive just to make sure that the wider community doesn't fall in the habit of not capitalising nouns (as I have)?
And any suggestions on how to remind yourself?

[deactivated user]

I think that falls in the "typo tolerance" discussion where Duolingo allows certain "not-so-correct" answers to pass by. Similarly to noun capitalization you can also type without the umlauts. Both are kind of important to know but there's no option that I know of that requires you to write that in the correct way.

I would also support a user option that forced us to use noun capitalization and umlauts.

[gatiquo]

Sometimes Duo lets typos go through and sometimes he doesn't.

[mizinamo]

It's not possible to influence the grading mechanism, as far as I know, and to enforce (or ignore) capitalisation or punctuation or other things.