Alright, so I spent like 5 minutes trying to figure out what I was doing wrong in passing the command line parameter to change the background colour for SumatraPDF Portable through the AppNamePortable.ini file. Then I decided to try to disable the splash, which didn't work either. I didn't check the source much yet, but I'm thinking that it's not reading the INI file properly, or not properly reading all the variables and applying them.
Thought I'd point that out. Some confirmation from others would be good, too.