I very much doubt it John, the stipulation for five lever lock will be mentioned in the insurance policy wording, so could not easily be amended without some form of codecil. As for basic shed security, what about the door hinges?
A hasp and staple can be easily levered off, as can the hinges.
Sheds in general are not very strongly constructed anyway, it would not be difficult for a theif to break in no matter what security you have. Security lights, loud alarms etc will only help if YOU are around to see/hear them, everyone else will just ignore them.
Sorry to be so negative, but poor shed security is a fact of life, you really need to think like a their – how would you break in? Try thinking outside the box, a crowbar and or a  portable electric saw can defeat most things.
In reality you are fighting a loosing battle, anything that is valuable that can not be bolted down should be out of site or in the main house.Â
Don't advertise what you have, you never know who might be listening.