@fencepost … your feature request seems to have some overlap with this one: Sync Bitwarden settings, like "Lock after X minutes" or PIN and/or this one: Permit exporting and importing client configurations ?!
BTW, do you really mean “minimum lock time”? So minimum of 15 minutes - but if it were 24 hours, it’s also okay? Either I have brain fog today, or I think you mean a maximum lock time, right (e.g. “max. 15 minutes - or less…”) ?! PS: Assuming you aim at the security - and not at convenience…