Adding import Tempo Track Checklist in the Import Track from Project Menu, so I can import tempo track from one project to another without import/export tempo project first
Adding import Arranger track too in import Track from project menu
+1… certainly for the Tempo (and Time Signature) track.
The Arranger track might need a bit more work to achieve (there isn’t even a “regular” Export/Import" function for the Arranger track yet 
)
+1
+1. The way you get the tempo in is completely non-intuitive and easy to forget because the option you need to check seemingly has nothing to do with tempo.
+1
+1.
The ability to store tempo tracks as presets would be handy too – quicker than locating a track to import.
+1
And adding to that, being able to read this kinda key statistics out of the project before even open it.