I have been tinkering with it some more trying to get the deauthentication to work, sofar not very succesfully (sorry @Trine) (same old story, works in xterm but not properly through the program calls).

In the meantime I made some ui changes, that are attached in the archive below with all of my other changes upto now (Main.py, FAS.py readAP.sh getinfo.sh scan.sh getmacmanaged.sh getmacmonitor.sh). Details are given in the Main.py file.
1) Start Packet Capture button now only becomes active when an AP is selected.
2) Injection Enable/Disable buttons now toggle after first button press.
3) Selecting a key file now shows key (Get Key button functionality redundant).
4) Re-purposed Get Key button to Clear Key button.
5) All clear buttons (WEP / WPA / Key) now delete individual files rather than all the files.
6) Selecting WEP / WPA / Key tab now performs a refresh of the files (ie. Refresh Cap button redundant).
7) WEP and WPA Decrypt button only activate when a cap file has been selected.

As per usual, make a back-up copy of the files to be replaced, copy the archive to the FAS directory on your N900 and extract with in xterm in the FAS directory:

tar -xzvf faircrack0.41.tar.gz

Enjoy