Direct Loop Cut
Insert an edge loop on an edge at the mouse pointer. No selection needed (option).
VIDEO (YT)
Slide: Uses built-in Edge Slide afterwards
Center Cuts: With edge(s) selected & with the mouse over nothing or another object, a center-cut will performed
Multi-Cuts: Center Cuts, as above, on all selected edges' edge rings.
Limit Faces: Selected faces (on the edge ring) will limit the cut to those faces. Point the mouse over intended starting edge (or near it in space for mid-cut).
Note: This works on "checker-selected" faces too.
It also works on Loose Edges (select and point, or multi-cut as above)
Option:
Selection-Only or
Mouse Pick Toggle.
Direct Insert Vertex
Variant of Direct Loop Cut that just inserts a single vertex.
Slide: Uses built-in Vertex Slide afterwards
Option:
Selection-Only (or Mouse Pick) Toggle. (Shared with Direct Loop Cut)