Not really. When the door is all the way down the springs are at full tension so anything less would actually be less stress on the mechanicals. As long as only your cat takes oppertunity to come and go as they please, it isn't a big deal.
I don't believe so. My friend does this all the time.
Over an extended period of time it may have some negligble affect on the cables and such--but when we got our door installed we were not advised against this.
Now as far as the can't. I will warn you that if you have kitty food--that other little critters may be coming for visits in your garage as well. So that is the only thing to be careful of.
My dd used to keep the garage door open out of laziness. She was to lazy to push the button to close it. A week later we had 2 possums (sp?) in there. They wouldn't get out no matter what we did. We finally had to put traps down. Took me along time to go into that garage after that.
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