quiet flag vs. notify permission

[pschichtel]

We faced a question that we couldn't and didn't want to answer alone:

When a player runs an command (e.g. /invsee) on another player, should the other player:

1. always be notfied, except when the sender specifies a specific flag (e.g. /invsee -quiet)? this flag would require a permission (e.g. cubeengine.basics.command.invsee.quiet).
2. only be notified if has a specific permission (e.g. cubeengine.basics.command.invsee.notify)

Essentials uses the notfiy permission, CommandBook uses the quiet (-q or -quiet) flag