No ST high score club : maybe because there are some ST Offline Tournaments for Midi Maze and many other games.
Note that you can also grab friends and play Gauntlet2/Kickoff2 (up to 4 players) and Dynabusters (up to 6 players) on a STE computer.
Add 3 jumbo pizzas and a bunch of beer then you're done !
No ST programming sub-form : you're right that's rather surprising. Many atarians still program games and utilities under Pure C, ASM68k and even GFA basic.
A dedicated sub-foum would be nice ...