I needed to customize the HelpDesk template that is freely downloadable from Microsoft. I discovered that it is not possible to add any choice items or even delete the column. Here's what I experienced when I clicked on:
Service Requests ==> Site Settings ==> List Settings ==> Status
You will notice that the "Delete" button is missing and no choice items can be changed.
I discovered that the choice field is sealed in the feature template itself.
Solution:
1) Open the schema.xml file located in the SharePoint 2007 12-hives directory at:
%ProgramFiles%\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\FEATURES\HelpDeskServiceRequestsList\servicerequest
2) Search for the Status field.
<Field ID="{75AF1E7D-39F1-45db-908A-B7AD3F26531A}"
Type="Choice"
Name="Status"
DisplayName="$Resources:hlpdsk,SRStatus;"
StaticName="Status"
Required="TRUE"
Sealed="TRUE"
Format="Dropdown"
FillInChoice="FALSE"
SourceID="http://schemas.microsoft.com/sharepoint/v3"
>
<Default>$Resources:hlpdsk,SRStatus_Choice1;</Default>
<CHOICES>
<CHOICE>$Resources:hlpdsk,SRStatus_Choice1;</CHOICE>
<CHOICE>$Resources:hlpdsk,SRStatus_Choice2;</CHOICE>
<CHOICE>$Resources:hlpdsk,SRStatus_Choice3;</CHOICE>
<CHOICE>$Resources:hlpdsk,SRStatus_Choice4;</CHOICE>
</CHOICES>
</Field>
3) Change the Sealed attribute value from TRUE to FALSE
4) Save the schema.xml file
5) Restart IIS
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