I would like to know how to get rid of the annoying warnings about some dialogue that pop up everytime I start the CS.

I know it should be possible for there to be a 'cancel' button to avoid having to manually click through the warnings, I just don't know how to make the cancel button appear.

Would be nice if someone could help me out.

Add

AllowYesToAll=1

to the [General] section in Morrowind.ini

Keep in mind, that using this function, and then clicking Cancel, may prevent other errors from coming up, including these actually important. You can just hold Enter for a while.

Yes to All is the best change you can make to an INI. As stated above, you may want to step your way through the error messages instead of hitting Cancel (which is Yes to All)

All of the error messages should appear in the warnings.txt file, so you can review that before loading up Morrowind again if you want to make sure you didn't miss an actual error.