We're not the landlords, y'all, so about 99% of your suggestions (okay, 75% with the door-locking thing) are fairly useless.
Just saying. =|
We actually already have a door lock that we use when we sleep, but we have no key (it was there when we moved in). Unfortunately a new lock isn't in the budget right now (rent and the ridiculous utility sums we've had since we moved in have raped us, and the job market/financial aid suck =|

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Thanks anyways guys.