Multisite login - stay logged in for all sites / site types

I have set up my multisite with completely different URLs (not subdomains).
Each site requires me to login separately (for editing pages). This is not very user friendly when trying to manage multiple sites from 1 dashboard.

For example - > Full Sitemap → Some site → Some page → Visit

Is it possible to stay logged in for all sites?

Maybe a feature in an upcoming version?

Other small issues:
If I add a page to one of the Site types it opens editmode of the draft (logged in) but in the Default Site type theme and settings (site name, url etc), not the Site type I added the page to.

I believe there is a cookie_domains config setting you might be able to set to include the domains you want, although it might only work for subdomains you can wildcard, not quite sure.