All you have to do to find the info is read the readme on their github page which tells you the CLI usage. The current module uses slashes for the flags (/b) and the documentation uses hyphens (-b). Backup your module then modify line 261 from
Code:
primaryExe.Run(" /b /e """ . romPath . "\" . romName . romExtension . """") ; /b = batch (exit dolphin with emu), /e = load file
to
Code:
primaryExe.Run(" -b -e """ . romPath . "\" . romName . romExtension . """") ; -b = batch (exit dolphin with emu), -e = load file
The /b flag in the comment on line 259 should also be changed for the next module release for accuracy but it won't effect the launching at all of course. Did a very quick test using Dolphin build 5.0-2877 and it launches fine from RL for me.