Here's one for you.....
I define my Content Type to RemoveFieldRef Title and use MyAlternativeTitle instead:
<ContentType ID="0x0100D767501FD80F4d16ADABFB50EFDE0B8B"
Name="MyContentType"
Group="CMH"
Description="CMH My Content Type"
Sealed="FALSE"
ReadOnly="FALSE"
Hidden="FALSE">
<FieldRefs>
<RemoveFieldRef ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" Name="Title"/>
<FieldRef ID="{C9876BF9-4D64-4277-BC0A-5FE974925959}" Name="MyAlternativeTitle" />
</FieldRefs>
</ContentType>
However, the tool does not show the RemoveFieldRef in the CAML it generates:
<?xml version="1.0" encoding="utf-8" ?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<ContentType ID='0x0100D767501FD80F4D16ADABFB50EFDE0B8B' Name='MyContentType' Group='CMH' Version='0'>
<FieldRefs>
<FieldRef ID="{C9876BF9-4D64-4277-BC0A-5FE974925959}" Name="MyAlternativeTitle" />
</FieldRefs>
</ContentType>
</Elements>
http://www.chrishines.com/techblog