It would be nice (required in some cases) to add new settings in LDAP configuration.
I provide the followings parameters (corresponding to ldapsearch tested options):
- Enable/Disable Sort on Server Side
 - If enabled, choose sorting parameters (-E sss=<Sort parameters>)
 - Dereferencing Aliases Option : (-a <value> , with value in (never, always)
 - Size limit : (-z 200)
 
These settings can be very usefull to improve LDAP request performances.