You can override the default action of signatures in the anti-spyware profile from, in this case, "alert" to whatever youd like. Does this address what you need?
Edit adding more specifics: You can go to the signature exceptions tab of an anti-spyware profile, then select the show all signatures check box in the bottom left, find the signature you are looking for and change the action to what you would like, and make sure to select the enable check box on the signature itself for any signatures you edit. Then apply this anti-spyware profile to the rules you'd like, either directly or through a security profile. This is also all under the assumption you have a threat protection license.
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