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The erratic locking could be down to the low battery voltage. Car electrics can get pretty cranky in under-voltage conditions.
As for the starting problem, cars generally won't 'jump start' immediately on a flat battery anyway. Look at the length (or lack of it) and thickness of the cables from the battery to the chassis and starter motor, and compare them with the ones on the jump leads. You need to at least partially charge the battery via the jump leads before attempting to turn over the engine. Swapping pedals was probably pure coincidence.
I'd say that 300 milliamps is probably excessive drain. I'd expect the alarm to pull around a tenth of that and the other systems to do about the same. But even so, I'f expect 80 amp hour (I'm guessing) battery to survive for a lot longer than 24 hours from a full charge before failing to start the car. Or are you just doing the kind of short runs where the battery isn't getting the chance to fully recharge?
Currently in Horatio's garage:
2010 Laguna III Initiale.