User attributes checked by Delta Discovery in SCCM 2012

Question

Hi All,
Since I simply cannot find an answer to my question using google, will ask it here and hope you can help me.
Which EXACT User attributes does Delta Discovery check for in SCCM 2012? Is it possible to manipulate this, and add one more attribute?
Microsoft's answer to this question is a simple: Basic User Information, but that not an exact answer.
Here is the deal. We updated the extensionAttribute12 with computernames, so that we know what the primary device for a User is (I know this feature is present in CM12, but we will not use it for reasons). This information will be collected by User Discovery
and by using a nested query in the device collection, the Primary device will be added to it. This works like a charm, the only issue is time. We need that value to be checked by delta discovery if it has been changed, however this only works with FULL discovery
which is set to 1 week. If I lower this value that might cause serious backlogs, as the jobs get piled up in the inboxes due to the large amount of DDR files. Is there anything we can do? Powershell script, a configuration file in CM12 for delta discovery
or something. We really don't what to set the User discovery to run a FULL scan every 4 hours or so, as I don't know what would happen when checking for 24k Users.
Thank you in advance for any sort of feedback!
Regards,

Answer 1

Hi,
Well, I checked the attribute if its replicated to the GC and according to this line isMemberOfPartialAttributeSet: TRUE it does. Will run a test again with delta discovery, and if that failes, will try to change the SystemFlag on it.
dn:CN=ms-Exch-Extension-Attribute-12,CN=Schema,CN=Configuration
>objectClass: top
>objectClass: attributeSchema
>cn: ms-Exch-Extension-Attribute-12
>distinguishedName: CN=ms-Exch-Extension-Attribute-12,CN=Schema,CN=Configuration
>instanceType: 4
>whenCreated: 20050715092317.0Z
>whenChanged: 20110528160036.0Z
>uSNCreated: 6155
>attributeID: 1.2.840.113556.1.2.600
>attributeSyntax: 2.5.5.12
>isSingleValued: TRUE
>rangeLower: 1
>rangeUpper: 2048
>mAPIID: 35928
>uSNChanged: 6155
>showInAdvancedViewOnly: TRUE
>adminDisplayName: ms-Exch-Extension-Attribute-12
>adminDescription: ms-Exch-Extension-Attribute-12
>oMSyntax: 64
>searchFlags: 16
>lDAPDisplayName: extensionAttribute12
>name: ms-Exch-Extension-Attribute-12
>objectGUID: {5AC9437E-18AE-4EE6-909B-94CC1B6EF1C5}
>schemaIDGUID: {167757F7-47F3-11D1-A9C3-0000F80367C1}
>attributeSecurityGUID: {E48D0154-BCF8-11D1-8702-00C04FB96050}
>isMemberOfPartialAttributeSet: TRUE
>objectCategory: CN=Attribute-Schema,CN=Schema,CN=Configuration
>dSCorePropagationData: 16010101000000.0Z
>msDS-IntId: -1992421057