I haven't been able to find any info about this, whether or not it's possible.
I'm writing an external app that I want to give the ability to really put projects on hold (i.e. browse only, can't create/modify/etc... issues), and remove that hold. Everything is working fine in terms of the communication between the two apps, but I can't find the API hook to change the permission scheme associated with a project.
Can anyone point me in the right direction or tell me if this is just something that can't be done?