Sorry it took so long to get to this. Early spring is always rough for us as we have to get so much sorted for tax season and I am still behind on getting some things updated. Also, I will be making many of the same points that @dingotush already made.
You make some good points but General Games is mainly meant for mods or discussion of games that where produced without a fetish vision but contain some in it any way. For example games with character creators that allow you to make fairly large characters or games like Overlord 2 that had a fair amount of fat content in it.
Mods are a bit of an odd edge case though. In general if the mod is under development and the dev is the one making the post #projects is most appropriate, but if some one is simply trying to make others aware of a mod then #general-games might be the better location.
In the end there is a fair bit of general overlap and in the end we just try to make the best call we can.
To give some examples of how our reasoning works I will use your above examples.
Star Wars The Old Republic RolePlay Guild and other RP servers we do not really consider ‘games’ even if they make use of a game. They are more of a general community derived thing and we actually used to have a dedicated topic for them before the forum went down but they tended to lead people to RPing on the server which junked up the feed. Due to that we see these posts more as advertisements and encourage them to really only be casual discussions so we tend to leave them in #general-discussion.
SO Call of Cthulhu , Bitlife?, and someone have this pokemon hack rom are actually questions being asked by other members and not games themselves. Since they are not discussing anything that is known to be in existence or tied to a specific game its more or less seen as a general discussion and thus left in #general-discussion. An argument could be made that maybe Bitlife should be in #projects:ideas but there is not enough there to really constitute a well formed idea for a game or mod, just a general suggestion.
Friday Night Funkin Fat Girl Mod en proceso - You are right about this one and it has been moved to #general-games and tagged with mod.
The best that can be done is really just flag any topic you think is in the wrong category. Selecting Something else and then explaining why you think it is in the wrong category is probably the best way to go about it.