Hi Folks,
<Parks hat on

> I don't know anyone in Parks who would object to small scale maintenance such as kicking out drains in boggy holes or moving limbs off tracks - personally I do both of those on regular walks (despite that being technically illegal). Its when it comes to the prolonged use of tools that things could get messy legally BUT there are plenty of ways to actually help out Parks if you are so inclined. Most of it comes down to a good rapport with the parks staff because unfortunately we do come across folks illegally cutting tracks with saws/slashers/chainsaws etc into areas where it would be inappropriate.
If you have a genuine desire to do this stuff then it can be accommodated - just visit the local Ranger in the place where you want to do the work and build that rapport. Wildcare is another choice (
http://www.wildcaretas.org.au/) because it can cover insurance for participants and even provide funds for tools, gloves etc. There is also an agreement between the agency and some walking clubs to "work as you walk" which allows small works with handtools - this is also generally affiliated with Wildcare (in some cases for cheap insurance cover).
There are also programs for folk that want to work on historic huts. Mountain Huts Preservation Society has just signed a five-year partnership agreement to do work on a range of huts and bridges.
Happy to put folks in contact with the right people if you are interested.
PS - as for the fires - there is a clause in regulations that allows for a well controlled fire in an emergency - again I cant see any Ranger getting hostile if next to that fire is an injured or hypothermic walker waiting for a helicopter or rescue party.