@jan I’m not sure what a design pull request is, so do feel free to point me to the right resources (if it differs from a normal PR)
I’d like to imagine something like this:
Sharing the link doesn’t change, that has to be done regardless of the type of share you’re creating.
However instead of obscuring that pretty awesome filedrop feature behind “allow edit”, bring it up front and centre.
In the screenshot above I’ve added some clarity. The wording may not be perfect but that’s not super important currently. When sharing has been ticked, the user is given the options to:
a. Allow remote users to view and edit directory contents
or
b. Create a File Drop folder (a small 
tooltip wouldn’t go amiss here, just to make sure users understand)
Whichever one is selected greys the other out, for obvious reasons. Edit folder contents could be transparently enabled when selecting File Drop which I guess would allow some of the logic already in place on that checkbox area to remain.
That would make it clearer I think.
I’m also a bit biased towards this type of feature (I use File Request so much in dropbox) and I’d like to see it more prominently offered…
But that’s more wishful thinking than anything else 