Lync Custom Status requires administrative privileges as it needs to use parts of the system registry that are normally not accessible unless you have admin permissions. This is a restriction of user account control, and not something that can be bypassed.
The only registry keys that are accessed are as follows:
HKEY_CURRENT_USERSoftwarePoliciesMicrosoftCommunicator
HKEY_LOCAL_MACHINESoftwarePoliciesMicrosoftOffice15.0Lync
HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionAppCompatFlagsLayers
HKEY_CURRENT_USERRun
HKEY_CURRENT_USERSoftwareMikeSel.infoLCS2014
The application changes the Lync related values to allow for custom status’ and to enable ‘hidden settings’