Hey, just to give you another option if you can't fix WebLaunch, there's this round about way that might just help you.
Can run full blown Chromium browser on up-to-date Alpine Linux
The catch is that it drains the battery faster, and I haven't actually tried disabling the screen saver with it. That and if you lock the desktop I don't know how to unlock it save a full reboot.
Code:
There's also these commands you can type on the searchbar
which might help:
;debugOn
~disableScreensaver
~resumeScreensaver (if it doesn't just restart)
In any case, you can rotate the screen, put chrome on fullscreen, and watch YouTube... for all it's worth.