The next stable release is set to make large breaking changes to existing projects.
This will result in people either sticking to old versions of construct 3, or reworking their projects to adapt to the changes.
This time is just like the shift from Construct 2 to Construct 3: you have to convert your projects to work between the different versions. Or stay with C2 until you're project was finished.
Therefore, since compatibility is already going to be disrupted, maybe this is also the right time to address longstanding issues that may have been seen as untouchable for fear of breaking old projects.
Here are 2 ideas that come to mind for me, perhaps other people will know of more? Feel free to share yours too!
• make animation speed fully framerate independent
• make events in groups count as "top level events" and not treated as being sub-events. It's unituitive, since Groups are useful for organizing top level events.