I don't think shared meshes have anything to do with this, the output looks identical to me if I make each object use its own mesh.

Confirmed on first sight.
Ranges start taking effect when using the Value Slider or inserting a keyframe. Also confirming that 2.77 does apply range on framechange [not on file-load though]

Made changes requested by @Campbell Barton (campbellbarton) .

Thanks @Thomas Beck (plasmasolutions) , I've created a patch and added you as the reviewer. Please let me know if I did everything right. Once it's approved I'll move forward with more changes.

@Lee Anderson (la10) Hi Lee, great that you'd like to help! Send in patches but start from the bottom of the list as I'm currently processing all items starting from the top and don't want us to have duplicated efforts on the same item..
From now on, I'll just add an "(in process)" to the item when I'm on it, so others can see which ones are worked on.

Updated diff as per requested revision

Committed

Committed

Select toggle needs to check all objects for selection, see edit-mesh code.

@Campbell Barton (campbellbarton) I'd like to help contribute completing this task. I currently don't have commit rights, how do I proceed with submitting my code changes for review?

I believe MESH_OT_extrude_edges_move and MESH_OT_extrude_vertices_move are complete since they use MESH_OT_extrude_faces_indiv and MESH_OT_extrude_verts_indiv.

Remove commented code.

confirmed on first sight, studying bridge_loop_pair now.