Pluto does not provide any special support for wireless network, so you have to set it up manually. Network config is stored in mysql tables and upon every boot it is extracted and written in /etc/network/interfaces file, so you have to modify /usr/pluto/bin/Network_setup.sh in order to overwrite the freshly extracted config with one that suits your needs.
I initially tried this option as I also could not even think to break walls and make additional wiring to my apartment, but the result has been not exactly brilliant.
Probably this is also due to my wireless dongle drivers, that are still in development and that cause annoying connection drops, with subsequent MD and Orbiter failing to work.
Nevertheless it was an experience that was worth doing because this forced me to think to an alternative solution.
In the end the solution came out, and i'm quite happy with it. Basically the apartment where I live has tv cable reaching every room, so I simply used those cable run to pass also some ethernet cable.
If you have similar situation, I would suggest you to drop your wireless design and go for a wired solution.
Otherwise be prepared to have kind of a frustrating overall performance.