Go discuss your requirements with a locksmith. You could have a system where all locks are keyed differently but supplied with a key/keys that open them all, (common keyed) that way you only have to carry one key with you. Re 'bumping', get your locks with a restricted key section, that way it's highly unlikely someone will have the correct 'bump' key that will open your locks. For insurance purposes your cylinders must be 6 pin & fitted with security escutcheons. As to whether thumbturns on the inside are acceptable it's a bit of a grey area, if someone climbs in through a window he/she can open the door from the inside and let their accomplices in and carry your telly etc out. In premises such as guest houses the fire officers will insist on thumbturns internally so there must be some compromise.