The main reason they put time limits on the forum posting is because of limited bandwith...if everyone was posting like a mad man then the forum would creep along...I noticed this on another forum I used before....they moved it form 10 seconds between posts to 30 seconds between posts...
As far as loosing your text there is a backup method if you remember to do it...
after typing everything copy the text (Ctrl + C) then hit the post reply button...if it screws up you still have your text saved in temporary memory...So if you have sellected the text and did the Ctrl + C and you lost your window, reopen it then press Ctrl + V and it will paste the text that was copied...So it's enough to remember to do this but it sure beats loosing 10-20 minutes of typing...If nothing else just type it in a word document then copy and past it into the forum window......Ok, I am copying before I press reply
