Solved! Go to Solution.
This is an old thread, but perhaps this will help someone in the future...
I also wanted the user to be able to select mROIs without holding down CTRL. A simple trick is using the "Mouse Down?" filter event.
With this filter event, you can make windows "think" ctrl was pressed by modifying the PlatMods.Ctrl node.
In the image, I'm just showing a TRUE constant. However, I recommend you do some conditional logic to enable and disable "multiple ROI mode"
Anyway, this probably isn't useful to you now, but maybe it will be helpful to someone else 😊