I also has some UI suggestion:
1. Please put the project PATH (or at least Project filename) to the windows title, for example :
For single capx file: C:\Dropbox\Scirra\MyProject\SexyAnimeGirlPlatformer.capx
For Project folder: C:\Dropbox\MyProject\Scirra\SpaceClown.caproj
When we switch between layout / event, it should automatically update the title respective to the project,
This will make it easier especially when you have multiple project open at the same time.
2. One project should share one color, this will make it easier to distinguish multiple project opened at the same time.
3. I agree with 2 color suggestion for Layout & Event instead of multiple color like right now.
For example, we have 3 Project open at the same time:
Project 1: Red
Project 1 Layout: Light Red
Project 1 Event Sheet: Slightly darker Red
(or a different saturation of red, basically it should keep the hue to distinguished it from another project)
Project 2: Blue
Project 1 Layout: Light Blue
Project 1 Layout: Darker Blue
Project 3: Green
Project 1 Layout: Light Green
Project 1 Layout: Darker Green
Or this is optional and if we want to be fancy: user can choose their own project color and save it with the project,
in case they don't like the random color assigned to the project.