There are existing requests for most of your suggestions. Creating multiple threads for suggestions tends to split votes, reducing their impact. It’s better to add your vote and comments to the existing threads. It’s also better to keep to the guideline of one suggestion per thread. This makes it impossible for people to vote for individual suggestions.
Stop renaming photo/video uploads
Share Multiple Photos at once and complete Folders
[Feature Request] Photo Slideshow speed controls
There are suggestions for zooming in on photos, but I didn’t find one specifically linked to slideshows. If that was your intent, then your suggestion may be unique.
