Quoting from another thread:
I'm always interested in hearing people's suggestions and learning about pain points that I haven't experienced myself.
Here's one (I've waited a few hours before posting to trigger it again, but I'll only know if it was long enough when I click Post):
Your session timed out while posting. Please try to re-submit your message.
It's probably not a bug but a feature, but I've seen this far too many times. I often leave a tab open and come back to it hours later.
Sometimes it takes me days, in that case I don't mind the error. A couple more hours would be appreciated.
I think it's likely that this one (and similar session-expiry notices) will be partially addressed soon...
SMF has a "keepalive" mechanism that was disabled at some point (for good reason). I came up with a pretty nice fix for this which I shared with theymos a few days ago.
As some of you already know, I'm winding down my forum-improvement efforts and will soon be spending less time here. If there's anything in particular that you'd like me to try and get done before moving on, then the next few weeks/months would be the right time to share those thoughts with me (either in this thread, or with a PM, I don't mind).