PlanetsCentral

another advantage is that if you list the upload as "not ready", but then change your mind for any reason, then you could just change your turn from marked "not ready" to "ready" without having to upload your turn again. this has happened to me once, already.

I understand your problem. You want a method to mark a turn "not ready" that takes less effort than re-uploading. I'll definitely add that when I have a way to add some sort of "menu bar" for all those little options. Until then, there's ComCitCat's workaround. Or these:

Workaround #2: use this link

    http://planetscentral.com/host/uploadturn.cgi?action=marktemp&game=GAME&slot=SLOT&marktemp=checked

Fill in GAME and SLOT.

Workaround #3: configure the game for online play (Game -> Your settings View/Change -> "Play online with PCC2 Web" -> Save). You need to do this once. Then, to re-upload your turn, open it in PCC2 Web (Play tab, then pick game), immediately exit PCC2 Web (menu in top-right corner), and terminate the session. This will regenerate the turn file (with the same content) and upload that, and ask to mark it "not ready".

--Stefan