Adding extra constraints to logged activities

[Anonymous]

I am trying to add a constraint in a smartlist that is a custom activity field in my Salesforce – how can i get extra constraints to show in the dropdown?

[Anonymous]

Not possible out of the box. There isn't even the option to use standard field "Type" from activities.

[Jim_Thao7]

I don't believe this is possible (from what I know/seen).  You can do this with SFDC custom objects, but not with Marketo's default filters.