I have just released betfair web api app called: Cash Out All
The web app is free for all, and you can open it here:
As the name could suggest the web app allows to cash out all your open markets or just selecting ones.
In the bfexplorer app the tool with the same features is called: My Bet Position, or when executed by bot on one market the bot is called: Close Market Bet Position
Any feedback or feature request/s are welcome.