Only people care about descriptive names like
pageDown; to a computer,
ma is just as good. It turns out that these compressed names will change from release to release, as we tweak the code (the more often a name is used, the shorter the compressed name that's chosen for it). Greasemonkey scripts that rely on these compressed names (like the aforementioned one) will therefore break.
simulateClick function is included in the script):
I hope this helps other Greasemonkey scripts authors that are trying to tweak Reader (and other sites too).
P.S. We just pushed a new Reader release. No new features, but we have fixed a few bugs with unsubscribing and keeping things unread.