> Please add ability to enter time (hh:mm:ss) format and date too for single download

There is a "dateString" variable:
https://github.com/eight04/image-picka#filename-pattern

Does it fit your needs?

> this extension always maps back to downloads folder, instead must go to the folder I previously saved an image to just like built in firefox image download

This is a bug in Firefox. See https://github.com/eight04/image-picka/issues/15