Possibility to change the default working directory of remote agents, before authorize them>

Currently, to change the working directory of agents, it is needed to do the following:

1. Install the agent.
2. Stop the agent.
3. Edit the <AGENT_HOME>/bamboo-agent.cfg.xml file changing the value for buildWorkingDirectory property to the new location.
4. Start the agent.
5. Aprove it.

I think it could be interesting, the possibility to edit the bamboo-agent.cfg.xml before install the agent. At least, the "working directory" property. It will be useful for the automation of the installation of the agents using Docker or Powershell, whatever.

And it could prevent Windows common errors, like a path too long. If the "bamboo agent home" plus "working directory" plus files projects is too long, can break the builds in Windows.