in 1.6.5 you removed a totally useful and essential feature from the properties menu - being able to toggle execution of shell scripts via double click. The current solution to this is typing this: xfconf-query --channel thunar --property /misc-exec-shell-scripts-by-default --create --type bool --set true My suggestion is that you restore the option because you are crippling your program with bufoonish restrictions. Solution: Literally uncomment that one line that the muppet in 2015 commented out because god knows what reason.
Executing shell scripts with double click with the file manager as a default behavior can be a security issue, that's why this behavior as been disabled. As you said, you can reactive the old behavior with xfconf. Please see https://bugzilla.xfce.org/show_bug.cgi?id=7596 for more explanations. Also, thanks for watching your language, contributors to the xfce project are volunteers and are doing code on their free time :)
Closing as wontfix, since we will not revert Bug #7596 for the reasons listed there. Besides of security concerns, note that there seem to be alot of people which asked for the current implementation.