I descided to create a work around.
I removed the foto option from the property listing page, but kept the features part.
Now at the bottom of the introduction text, i just add the Wordpress gallery (by uploading images and inserting the via Insert Gallery). The big difference is, that de pictures are now displayed mid page instead of at the bottom. Big plus is, that you can just insert 20/30/40 pics at once. Here, take a look at http://www.koorenclassiccars.nl/?p=1053
Thanks for your time and effort replying to my question.