Some more testing but no success.

I stopped the lsasd service, made a backup of the registry.db file and then tried manually inserting 2592000 (30 days) into the CacheEntryExpiry value. 

Restarted the service and ran lw-eventlog-cli -s - localhost to see there was any change. There wasn't.

Event Description....... Likewise authentication service provider configuration settings have been reloaded.

     Authentication provider:           lsa-activedirectory-provider
     Current settings are...
     Cache reaper timeout (secs):       2592000
     Cache entry expiry (secs):         14400
     Space replacement character:       '^'
     Domain separator character:        '\'
     Enable event log:                  false
     Logon membership requirements:     
        <No login restrictions specified>
     Log network connection events:     true
     Create K5Login file:               true
     Create home directory:             true
     Sign and seal LDAP traffic:        false
     Assume default domain:             true
     Sync system time:                  true
     Refresh user credentials:          true
     Machine password sync lifetime:    2592000
     Default Shell:                     /bin/bash
     Default home directory prefix:     /home
     Home directory template:           %H/%D/%U
     Umask:                             18
     Skeleton directory:                /etc/skel
     Cell support:                      Unprovisioned
     Trim user membership:              true
     NSS group members from cache only: false
     NSS user members from cache only:  false
     NSS enumeration enabled:           false
     Domain Manager check domain online (secs):          300
     Domain Manager unknown domain cache timeout (secs): 3600


Then I ran sudo lw-edit-reg and see a value change  "CacheEntryExpiry"=dword:32393532 

lw-refresh-configuration 
Configuration successfully loaded from disk.

lw-eventlog-cli -s - localhost

========================================
Event Record: (94/97) (94 total)
========================================
Event Record ID......... 94
Event Table Category.... System
Event Type.............. Information
Event Date.............. 2010-05-04
Event Time.............. 09:42:58 PM
Event Source............ Likewise LSASS
Event Category.......... Service
Event Source ID......... 1004
Event User.............. SYSTEM
Event Computer.......... sps31-728-ckr1
Event Description....... Likewise authentication service provider configuration settings have been reloaded.

     Authentication provider:           lsa-activedirectory-provider
     Current settings are...
     Cache reaper timeout (secs):       2592000
     Cache entry expiry (secs):         14400
     Space replacement character:       '^'
     Domain separator character:        '\'
     Enable event log:                  false
     Logon membership requirements:     
        <No login restrictions specified>
     Log network connection events:     true
     Create K5Login file:               true
     Create home directory:             true
     Sign and seal LDAP traffic:        false
     Assume default domain:             true
     Sync system time:                  true
     Refresh user credentials:          true
     Machine password sync lifetime:    2592000
     Default Shell:                     /bin/bash
     Default home directory prefix:     /home
     Home directory template:           %H/%D/%U
     Umask:                             18
     Skeleton directory:                /etc/skel
     Cell support:                      Unprovisioned
     Trim user membership:              true
     NSS group members from cache only: false
     NSS user members from cache only:  false
     NSS enumeration enabled:           false
     Domain Manager check domain online (secs):          300
     Domain Manager unknown domain cache timeout (secs): 3600
Event Data.............. <null>