Campaigns I'm On/Campaigns I Own (filter buttons and underlying filter paramaters)

(Note that Campaigns = Projects)

We have recently discovered the Campaigns I'm On/Campaigns I Own buttons that can be activated in a Layout Template (refer to Case Number 00260023).

Currently this filter provides ALL campaigns and it is not possible to modify the filter to exclude 'Complete' campaigns.

Is it possible to modify the underlying filter to exclude 'Complete' campaigns?