This is one my probs with an M3. The auto wipers are a pain in rain and without rain. I keep my windows clean inside and out. And the wipers just think its seeing moisture when there is none and will wipe. Even in rain, the wipers come on way too frequently. At least Tesla added some delay options a year or so ago. But it still needs improvement.
In my opinion, adding an old school cruise control would resolve the issue for me. But I think Tesla would go out of business before they added something that is just cruise control.
Also, I think this doesnt get much attention because many people never use cruise control with any car. So, it is a small part of owners, like me, that want cruise control. Therefore, it wont ever be addressed. I will just have to sit patiently until L3 exists; if ever.
A small price to pay for being an M3 owner....