Is your feature request related to a problem? Please describe.
No, but it's a feature to increase realism and customizability.

Describe the solution you'd like
Putting lifts on escalators saves space and time! Here's some examples.

Source: https://www.fourway.co.uk/

Source: https://www.railway-technology.com/

Source: https://www.malaymail.com

This is now possible in 4.0.0, thanks!