In the ACT, the EC can approve a ‘minor use’ of common property if it is ‘unlikely to unreasonably interfere with the use and enjoyment of the common property’ by other residents. I am not aware that other states have an equivalent provision to allow minor matters to be dealt with simply. Instead my impression is that the same process is used for everything from the most trivial to the most substantial private uses of common property. I expect this leads to a lot of pragmatic turning of blind eyes, which can occasionally come unstuck.
Our OC adopted a rule (aka bylaw) which explicitly makes unit (aka lot) owners responsible for their items of property on the common property, whether they have permission to leave them there or not.