1. I create an user account with SMB scan. Create a file prefix like "image". Select JPG format and scan to smb folder. Then i open SMB-folder ind find sub-folder like "image.XSM". Next scan created sub-folder "image000.XSM"....Why? I don't like this!
Anything done as a single page file format creates a folder to put it in, not sure why, and the Samsung controller has no way around that.
2. Why i can't to use cyrillic fonts in CMB-path?
You would likely need to ask in a Country where they would be used, this is an English only forum based in North America. I would expect it to fail immediately on anything I could test on since the firmware would not be Russian and could not be expected to understand the letters.
3. Then i create user_account and select them, i make scan. How i can select another user_account for another scan? In a scan dialogue i can see only "add recipient..." & previous user_account...
I don't quite understand this question, I would think you just pick another Scan to entry from the address book, because as far as I know, the device can't do scan to home (I may be wrong) so there would be no difference in where the scan goes due to the person who was logged in to the copier itself.