I know what you mean.
"it" doesn't decide if your question should be in FAQ, the moderators do. When they notice that a question pops up more often or if there's a perfect answer that should solve any future questions regarding the subject, they can decide to move the topic to the FAQ. Threads can't be started there indeed, to avoid people cluttering the FAQ with questions that simply don't belong there.
Everyone asks their questions in Retro MTB chat
, Retro Classic Road
,Bike Chat 98 -->
or Old school BMX
, depending on what kind of bike it's aimed at.