I haven't looked to see if that's possible but, if it's just about applying the same ACT, then I'd suggest putting the libraries in the same metadata folder and applying the ACT to that rather than explicitly to the libraries. Which is what I'd recommend anyway. If you store table definitions in the metadata then the ACT will also apply to them, which wouldn't necessarily be the case otherwise.
The danger with concatenating database libraries is if there are duplicate table names in different schemas. With my suggestion, to get round this, you could actually make subfolders for each library within the folder that the ACT is applied to.