This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
It would be really useful to have a checkbox in a projects run properties that adds the 'enable assert' flag to the runtime command line.
You can just add "-ea" to Run / VM Options. I am not sure a new checkbox is needed for this, though it might be mentioned in the hint below the text field. (Adding a checkbox is tricky in case an existing project had -ea in VM Options; during customization, would need to parse the options and pull this out, then add it back in during save. But there have been some reason why it was located in a particular position in the options.)
Another possibility is to offer code completion on known option names. (Could run 'java -help' followed by 'java -X' using the selected JDK, and grep for /^ +-[a-zA-Z]+/.)
I vote for the second option (the code completion). There is already lots of UI controls and adding a new one does not scale.
Also there is "Customize" button in the J2SE Project properties (VM options) where are the checkboxes. The Customize panel is in my opinion worse than the proposed code completion.