Pixelmator 3.2 released with magical content-aware fill
pixelmator.com
pixelmator.com
I still wish they'd add one feature that I sometimes need and feel very helpless without: http://choorucode.com/2010/02/08/irfanview-replicate-crop-on...
Trying to draw a pixel-precise selection with mouse when you have an exact number in mind (that would so easy to type) is extremely frustrating.
Have you tried using Pixelmator actions in Automator to replicate pixel-precise cropping? See http://imgur.com/nDTcxvS I recently processed hundreds of screenshots this way and it worked well.