Trading Forums: let us edit posts at any time
 

Not sure if this is possible with this forum software, but currently when you have completed your trade you have two options: say nothing and continue to get PMs which wastes everyone's time or reply, uselessly bumping the thread because the whole point is to say you're no longer buying/selling what's in that thread anymore.

Just bump it. Its ok.

This.

IIRC the auction forums used to allow editing for much longer (maybe forever?) I imagine the staff added the limit (as they do with most things trading-related) to make it harder to scam people.

That's just a guess, but given that they did it deliberately, I doubt they will bring the long editing window back.