I did use the feedback thing, but I have no idea if that is the best way. I'll be honest, I don't think they will ever read it, but I wanna try all my options.
If this helps, my feedback is about a missing feature: photos.google.com already uses tags, I can change/add tags in picasa and upload them, then when I search it finds pics based on tags. However the process is very backwards, un-intuitive and broken. If only they would add a small, bare bones feature where all you can do is add/delete tags without having to go trough the sync/block uplad & re-upload head-ache mess.