[circonian]

What about just just preventing the problem at the source. Stop using the right click context menu, and instead add an icon/button or something to each row entry that would pop-up our own custom context menu created with a library that could be shared, for use with all addons. Or Instead of adding a new button to the row just use the item icon that is already there as our button. Or just make it a left click context menu.
Either way then all of the code is our own. This would completely work around the secure code problem.

It could be a system like libAddonMenu, where addons can register themselves & each addon can have 1 entry to the main context menu (the entry referenced by the addon name registered) which will pop-up a second context menu for that addon, like in QuadroTonys More -> picture.