'Lets Go' splash screen - press 'Enter' key to continue

Or have a setting to bypass this screen all together.

The mouse is inconvenient and not necessary to go forward. 

I agree. I have to hop off my bike and walk over to the mouse. 

Here you go, https://zwifthacks.com/zwift-login/

That worked.  Thanks.

Also they have many other scripts that are very cool.  Worth checking out.