HI!
Many people are downloading and compiling "stable" releases from http://www.openldap.org/software/download/ which is IMO problematic:
Most developers consider those "stable" releases to be rather outdated since lots of fixes are missing and they don't want to get bothered with old issues (which I personally perfectly understand). ITS filed against those "stable" versions are most times answered like "get a more recent release".
There is no well-defined process how to determine whether a release has reached "stable" status.
=> My suggestion: Simply drop "stable" completely and list only the releases with version number without further qualification. Today most people can deal with version numbers quite well.
Ciao, Michael.