I previously sent an email to Samsumgs DeX team requesting sypport for the middle mouse button within the browser when in DeX mode.
Just a quick note to everyone:
I was looking through the 'Samsung-framework-res.apk' file resources previously, and it suggests that Samsung are working to bring a large quantity of desktop like features that we all are familiar with, I guess that this suggests that Samsung just didn't have the time to get it all ready before the release date deadline for the S8.
One of my favourite features that the resource files appear to suggest is coming is something similar to 'Window snap' on other OS', enabling you to quickly drag the window to the side to quickly fill half of the screen with that app in a dual app screen layout!
Thank you, I can't wait for the update