You can make any suggestions features you wish in the suggestions forum.
I beleive comments already have an edit timeframe feature. As far as photos you can enable users not to delete them but that is not your issue to a degree.
Your issue is a user deleted his personal album which is his right. You would have much the same effect on your forum if you deleted a category or if you moved alot of photos to another category.
Essentially all those are nice feature suggestions and please make them but links posted on a persons forum we have no control over since given the gallery is dynamic content where you can move around users can or can not delete move you delete move etc links change so broken links will always be apart of things. We can only control how things work on our end.
Forums use to allow script links for images where you did not have to worry about broken links but they did away with that along time ago.