When Xash3D was modded by Dr. Beef, the question came up how to comfortably start the other Half-Life games. The default was, that you manually had to edit the commandline.txt , copy it back to your Quest and then run the specific game. That caused quite an inconvenience for many of us (who remember). After a brief talk to Dr. Beef on reddit I decided to take his advise with a launcher type program seriously and this was the result.
The launcher is freeware and can be downloaded via SideQuest.

Download: SideQuest

Important: This is just a launcher. You will still need Dr. Beefs Lambda1VR as well as an original copy of Half-Life!