Possibility to disable/filter the Structure notifications in the project & user Activity Streams
Currently only the Actitvity Stream "gadget" has the option to configure filters.
The standard (non-gadget) Jira Activity Stream on the Project Summary page & on the User profile page does not have this option. Hence these Activity Streams are heavily 'polluted" with Syncronizer updates and are becoming useless..
I believe this should actually be a feature of JIRA - since from Structure's standpoint, it just provides the data (activity stream provider), while various JIRA components (gadget, issue page, user page) aggregate the data and use filters.
I'm not sure what can we do about that from the Structure plugin. I think you can try to disable Structure activity stream provider completely by disabling module "Structure(structure-provider)" (it's a bad name, we'll rename it).
I've posted improvement request for JIRA here - https://jira.atlassian.com/browse/JRA-27201 - please vote and you can also suggest the same to Atlassian for the user page.