I use a Coleman in the cabin..Heavens Forbid !
I stow the tanks in the vented, wet locker port side cockpit when not in use. Of course, the placement of the stove on the counter is nearly directly under the open hatch.
I have NO problem hooking it all up the night before so's I don;t hafta fiddle with it while still half asleep to start the coffee. If I'm staying at the dock, I'll leave it all rigged, ready to go if I wanna cook summat up. Leave the boat or get under way? It gets stowed, sans bottle. 40-some odd years of working with and camping with 1# canisters and I've never (yet!) had a leak. 20, 30 and 100 pounders? Yep..leak like sieves if ya don;t know what's what
Just use common sense and play it as safe as ya want. Lloyd's sponsored a destructive test of a sailboat. The propane section took enuff C-4 ta blow the boat up...really...than it needed to get the propane to go off. Took quite a few tries with escalating ignition sources, too