Hi acerguy,
I've spent a few hours playing around with this.
From what I can tell when you toggle off the search and site suggestions, or toggle it back on, the Registry automatically records this change in multiple locations. 0 = off, 1 = on.
On top of that former gems like SearchScope's ShowSearchSuggestionsGlobal DWORD (32-bit) value now no longer alter their state, but instead remain set on 0, which is supposed to be disabled or off.
Windows Enterprise or Mobile users who are willing to pay for access to a new service from Microsoft can set polices to prevent precisely what you want to do; however for a Home, or Professional user there is little you appear to be able to do other than rely on those toggles in the Browser itself, although Professional users still have a couple of Group Policies they can try if they wish.
I think this will end up being one of those bugs that Microsoft may fix with a future update - subject of course to whether enough people complain of the issue.
At this time I can see no work-around using the Registry - I've attempted to, but it appears Microsoft is blocking those older tricks now. I'll keep it in mind though and if any other ideas come to mind will see whether they work.
One part of the Registry you could modify currently has a warning key about Microsoft's TOS, so it would be unwise to tamper there as that would be breaching laws that would be stupid to do - given the far reach of lawyers and courts in the Global society we live in now.
The one thing I did not try was to do an in-place upgrade of Creator (i.e. reinstall it over the top). Actually two things: I also did not attempt to remove Edge, then re-install it. I suspect it will make little difference to be honest, but it may be worth attempting.
I see you have also approached Microsoft Community Forums with this question. The one posting there from a contributor will not resolve this issue. Perhaps when enough moan there they'll move the posts to TechNet site instead where someone may have better suggestions.
If you do come across a solution yourself, please do update this thread as we can all learn
Regards,
Regedit32
PS: If you want a list of Registry keys associated with this particular feature let me know and I'll post them in the thread.