Hi @pert,
No we do not think allowing editing of the whole website is something useful for both the Arduino Company and Community but we want to open as many places as possible if it makes sense to have contribution from the community. If you have any suggestion about what are the most relevant sections in your opinion to be opened then let me know and we will evaluate.
The search engine will roll out next week on the blog as first as a test then if users will like it we will extend to all our websites one by one.