In an unusual move, Timothy Armes has combined the Lightroom SDK with a 3rd party imaging tool to create LR/Mogrify. Currently up to version 1.7, his Export Plugin manages to add features high in the Feature Request forums. 

  • Sharpen on Export: Check
  • Create a 2 step border: Check
  • Positionable Custom Watermark: Check
  • Convert to more than 3 Colour Spaces: Check
  • FTP after all this?: Check

Based around ImageMagick and the mogrify command, LR/Mogrify is quite a versatile output tool for Lightroom users.

Tim has full instructions on installing both ImageMagick and the LR/Mogrify plugin on the LR/Mogrify page. He’s also been fulfilling a reasonable amount of user requests on it also. 
For those that find this free plugin useful, there’s a donate button on the page.