Sorry it might be a bit late, but you can increase the duration of the built-in one by running this command in terminal:
gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length 600
Replace 600 with the number of seconds you want to be able to record for.
I've been intrigued with this for a while and have found the way to disable Wayland!
Run this command:
sudo nano /etc/gdm3/daemon.conf
Find:
#WayLandEnabled=false
and remove the #.
Then press Ctrl+X, enter y, then press Enter.
Restart your computer.
Done! You are now using X11 again. All your screen recorders should now work. The built-in screen recorder (Ctrl+Alt+Shift+R) should be a LOT smoother now as well for old laptops.