Searching through the specification for the strings "user config" or "configuration files" turned up zero hits, so I would say no it doesn't specify this in any way.
Looking at the FHS - Filesystem Hierarchy Standard it had this bit:
User specific configuration files for applications are stored in the user's home directory in a file that starts with the '.' character (a "dot file"). If an application needs to create more than one dot file then they should be placed in a subdirectory with a name starting with a '.' character, (a "dot directory"). In this case the configuration files should not start with the '.' character. 11.
Looking through the list of POSIX configuration constants present in
<limits.h> is the only other place I can think of where something like this would be configured. Running the command
getconf <var> will return these types of results.
$ getconf _POSIX_CHILD_MAX
But looking through the list of definitions I don't see any pertaining to a user's home directory.