Operating system: Windows 10
Graphics card: GeForce GTX 1060/PCIe/SSE2
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Short description of error
I don't know if this is a feature, but if I selected in the user preference selection to use the left mouse I would expect left select/click to work on any menu. However, it doesn't work in Timeline editor. You have to use the right mouse button as usual. I'm not complaining if that is your intention but I would expect the left select button to choose the frame on left select settings.
Thank you for an innovative, rich, and inspiring upgrade of Blender!!! I have to think back as to what I've done in the last three years for myself :)
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).