Here's a custom file for Heraklion (LGIR) made my FSDG and published by Aerosoft. Didn't put that much time into it so it's not perfect and I did only configure those parking spots normally used by a B738 since I do all my flying in the NGX.
The customization file is based on the following BGL -> ...\Lockheed Martin\Prepar3D v2\FSDG\FSDG-Heraklion\FSDG-Heraklion_1\scenery\AFX_LGIR.BGL
Edited to add a new version of the config file after I realized I forgot to set pushback to 'None' for all parking spots where it's not needed. Sorry about that and for anyone who already downloaded the file please get rid of the first one and replace it with this new one.