I think I may have just uncovered a crazy bug in Slashdot’s moderation system.
If you click ‘Parent’ on the post you wish to moderate, you can then moderate the posts inside that sub-thread without immediately losing any moderator points, if you go back to the home screen after you moderate the comments.
It appears that the system does catch up with you periodically, and then deduct the points — but during that period of time it appears you can go far into negative deficit. For example, I ‘spent’ my last moderator point today five times (for research purposes; I certainly don’t plan on doing it again).
It looks like the points I ‘over-spent’ have stuck.
I wonder if this really is a new ‘discovery’, or if it’s commonly abused by Slashdot moderators? I hope not.