Guys, I stumbled upon this little freeware app to flash image files to USB sticks:

http://winflashtool.sysprogs.com/

What I liked is the ability to resize ext2 partitions during the flashing itself, meaning you can easily make it fill the entire disk space. I tested with nvOC and a 32 GB USB stick, and it correctly resized the root partition to fill the usually unused 16 GB disk space (meaning you can use it now).

Could be interesting for people who don't want to use GParted (or fdisk/resize2fs) after flashing, and just would like to use the entire disk space for the root partition.