We don't have a "per user" permissions system, its done via user groups.
1. I'm not sure what you are asking for here - adding "themselves" or their photos?
2. We don't support that type of naming system and to do so would require an extensive mod.
3. We only support db authentication using our internal system or various forum systems.
I'm not sure that PhotoPost will work for your project.
Please do not PM me for support or sales questions. Thank you for your understanding.