I don't know about you, but I've lost many of my drafted posts/topics due to my multitask attitude, system/browser malfunction, personal error and other reasons, which could be painful.
You made an excellent suggestion but as of press the forum no longer host any advertisement and aren't getting any commission from the hundreds of projects advertising on the forum through the various means the forum has made available for ads like signature, bounties etc. I know the forum administrative aren't complaining but is there any need for giving them more workload, you can just use the features that's already been in existence which is to preview your write up and they automatically saved as draft and those draft stay for a very long time.
I get the feeling of losing all your writes up after spending minutes and sometimes hours writing them (I have had similar experience) but we have to take it upon ourselves and be conscious) we can't rely on the forum on doing everything for us when they aren't generating revenue and basically running a charity program here. We're using this place for education, intonation and our various business free of charge so some minor issue can be sorted out by ourselves. Download a notepad on your mobile and you can carry out your draftiy there before copying and pasting on the forum if you feel the preview (draft) option on the forum isn't sufficient. Good suggestion though.