Well, the "proper" use for a gun-lock is either for securing a bike, or as "childproofing" of your kitchen cabinets. While the cable locks are better than the trigger-gaurd sort, they still slow down your response time if you ever need your gun in a hurry. The trigger-gaurd locks can even cause a gun to fire!
However, in regards to your question, I'm unaware of a problem with the springs. If your lock has the stee cable exposed, as some still do, you will want to drop the slide slowly in order to avoid potentially "peening" something out of spec on the steel cable. If the cable is covered/insulated, I don't -think- you'll have a problem dropping the slide normally.
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