1. 1.2.4 is the latest – next version coming soon.
2. This will be possible in the upcoming update: http://generatepress.com/forums/topic/disable-masonry-for-other-content-types/#post-84372
The new updates are coming, they’ve just been delayed. Wanting to release our next add-on with it has delayed it considerably, but we’re coming to the finish line 🙂