all the laptops I've ever had have been able to reliability pull the full power (like within 30 watts) of their power adapter rating so that's a good estimate
so it would be like you say I want Firefox to go thru the tunnel, you would want the DNS requests made from it to go thru as well, in this case they weren't tunneled and were just going to the normal dns server
not sure your exact case, but I would highly recommend using pipewire, Bluetooth audio devices were nothing but pain for me with pulse audio and they just worked on pipewire
I think you can already do this in one shortcuts, not sure of any standalone program that does, if definably accidentally bond like Ctrl+d, Ctrl+s to screenshot before
partitions are used for organizing, the downside is that more partitions make each one smaller
I end up running 1 btrfs partition sagred between all my installed Linux distros on one system
lvm is also awesome for resizing and moving partitions
my desktop right now has nvme0n1p1 as my efi partition and p2 as a lvm pv
inside that lvm I put everything else as it's very easy to resize and move them (I also have p2 encrypted with luks2)