Hi Crovig, and welcome. I see that you've had responses from two of the regulars, so I'll confine myself to the title and endgames.
I think if you interpret the title as 'Chaps, stick' then it becomes a suggestion of overlap.
Possible Listener endgames...I don't know I can recall all the many types, but generally they fall into recognisable categories. This is a downfall of the Listener nowadays : there aren't really so many innovative puzzles, but mostly iterations of various previous endgame types. Such as, 'wordsearch' which is basically staring at the completed grid until something horizontal, vertical or diagonal seems to make sense. Probably not the most skillful endgame, but variations of this theme have involved plotting the course of famous journeys, battles etc., which have been quite clever. Then you get the origami fetishists, thankfully not so frequently now, and the Blue Peter brigade, who encourage destroying the grid with scissors.
Not every puzzle uses an endgame. Many of the radials don't, and I remember an entertaining puzzle which converted letters into atomic numbers which was quite fun.