Grease Pencil - Select Next, Previous and Overlap

Select Next - selects the next stroke on the active layer

Select Previous - selects the previous stroke on the active layer

I am tempted to suggest these are binded to CTRL-+ and CTRL-- when in Stroke Select mode to speed up finding the stroke in a rats nest of overlapping strokes.

Select Overlap - with two or more strokes selected, select the points that are overlapped. Useful when used with Point->Merge.