How to CHANGE or DESELECT "Upgrade clients with package" _GLOBALY_

Hallo,

I have a question about clients upgrade.

I can "upgrade clients with package" from admin/install packages for whole tree of containers in one domain. OK.

BUT,

how can I _deselect_ (disable or delete) this package for _ALL_ containers later?

OR

how can I change settings of this upgrade (e.g. number of days for upgrade package) also for _ALL_ (or selected) containers?

I know only two ways - delete package (not applicable with latest version) or manually delete package in _EACH_ container and subcontainer and its subcontainers... (hundreds of containers in dozen domains - yeeeah!)

Can anyone help please?

Thank you very much for any hint WITHOUT manual intervence into sepm database.

Ondrej