Hey again Davision,
I just wanted to point out some other ways to move and transform your Static Meshes in the perspective viewport.
Edit Transform
I will go ahead and enter the feature request to edit the working pivot as well as using vertex snapping within blueprints. As for the selection of multiple meshes within the viewport and create a blueprint out of them, this feature was removed due to the new workflow introduce in 4.7. When we implemented this new UI for blueprint creation, we ran into some complications with trying to keep the old workflow as you mention. We are currently working on trying to re-introduce the composition of blueprints with multiple selected actors in the viewport.
If you have any other comments or concerns, or if you need additional assistance please let me know.
Cheers,