Feature request: Ability to choose to delete or not the tables during hook deletion

[phpony]

If hook contains some tables and IP.Board creates them during it's install, there will be a problems with upgrading and re-installing of this hook. Because as for now deletion of this hook also means a dropping it's database tables, which means loosing all user-created data.

There must be an option to do not drop any MySQL tables in common with hook deletion.

For example, this is actual for at last 2 hooks you can find in my signature. Uninstalling Multiava hook will drop all custom avatars, uninstalling Meta Everywhere hook means loosing all custom meta data. Even if you are doing this just for upgrade.