Few questions (pgSMB2, tile image)

[radimkohout]

Hello,
first, I would like to thank you for pgina fork, it is really nice tool. Second, I have a few questions about pgSMB2 and tile image:

1. Is there any way to use pgSMB2 for having the whole user directory on the Samba server?
2. What is the "User" part of pgSMB2 doing?
3. Is there any limitations on the size, location, or resolution of the BMP file for the tile? I've tried saving it into the Windows folder and Program Files (so normal users can't delete it), and the configuration window loads and previews it, but on the login screen it is transparent.