@Brigane There is, indeed, a way to use log-in info for Sky Scraper when using Selph Scraper.
https://github.com/sselph/scraper/wiki
In Command Line Flags under the sub-heading "Full List", and about 3/4 of the way down the commands, you will find the options to insert your log-in info. You have to run the scraper from the console and use the command line. You can also use the -console_src ss to force it to prioritize Sky Scraper.
As a side note, If you have some stubborn roms that won't scrape, you can edit a copy of the "Hash.csv" file to include the new hashes and then point the scraper at the updated file with -hash_file command. I use this technique all the time to scrape ps1 games that I made into .PBP files since their hashes are not in the original file.
If you have lots of roms that you need to get hashes for and add to the hash file, I wrote a nice little Powershell script that does a great job of spitting out hashes for files in lowercase. You can download it from this link:
https://drive.google.com/file/d/1saYP91JHvkgK8By60BRChSMakSxj3Sno/view?usp=sharing
The script runs on Windows 10 and is safe to use and distribute if you like it or feel it could help someone. The best part is being able to get the hashes output in lowercase, which is a pain in the butt if you are a Windows user.