Hello Evert!
I'm pleased to inform you that your idea was implemented, the selector was changed to a dropdown search, as you can see on the image below:

I would also like to take this opportunity to share with you that with the release of Platform Server - 11.12.0, you’ll now be able to activate the Technical Preview feature SEO-Friendly URLs for Reactive Web Apps, and configure site or page rules on reactive web apps.
We encourage you to try it out and give us your feedback!
Thanks for contributing with your ideas and participation.