these are a lot of questions!!
lets see. one thing about libraries reports. all the thing you load with library manager are saved for the current project you are working.
if you want for example archicad to keep to your next project the pictures you loaded in your previous, you have to select create new with latest project settings. thats how archicad keeps all your options and all your library things.
though this may be tricky because after 4-5 projects archicad keeps loading all the files you have added.
the best way i found (and still didnt find the time to make it happen) is to have an empty project with all the customization and all the library parts you want including pictures backgrounds and save it as a .tpl template.
every time you use this to create new files
and if you want some new parts to be loaded you make the change in the template and then you keep working.
i hope i helped you a little.