There is a checkbox called "Large Player Hit Box" in the Options tab of the "Player Sprites" window, accessible via Quest->Player. We have plenty of space to put an image that changes when checking/unchecking to describe what that checkbox does.
Large Player Hit Box image
Nice idea
That string comes from the herotile_dlg array in zq_custom.cpp
We could instantiate the TileFrame class in tileanim_frame.cpp like when editing items.