Latest update V 0.46 is finally attached below. In summary; this update has some more ui tweaks, fixes the new John version bug, adds interactive injection, adds cracking of WEP caps from multiple capture sessions, adds airolib-ng functions. Details as follows:

1) Added option for WPA decryption using user selectable airolib-ng generated database to speed up cracking U (This produces a rate of 2000 pwd/sec, compared to the John option 20 pwd/sec and word list option of also 20 pwd/sec on my set-up, this represents 100x improvement in the brute forcing step of checking the handshake against a known dictionary entry. However, the time it takes to produce this pwd database PMK pair is significant).
2) Added LibDb Tab to the Decrypt Tab to provide interface to airolib-ng functionality, specifically the following options:
--batch (WARNING: This may take a long time to finish +12hrs for 450k password file and 1 ESSID PMK calcs)
--clean all
--verify
--import essid (both user entered and from cap file name)
--import passwd (both user entered and from one per line password file)
This option creates the airolib-ng database pwddb in the diction subdirectory of the FAS directory.
3) Added interactive injection as per ssjtoma.
4) Minor UI update on the Monitor Tab now all buttons line up at the bottom.
5) Fixed use of John to be compatible with latest repository version of John.1.7.8 (also described here and here); previous version was John.1.7.7 jumbo (Note: APs with spaces currently don't work).
6) Minor UI change added display of AP signal strength on AP screen.
7) Minor UI change on Monitor Tab now Monitor Mode buttons are disabled if the wlan connection on the N900 is disabled and program will not hang anymore.
8) Enabled WEP crack of cap files from multiple session captures, ie. all APESSID-0x.cap files will now be used for cracking of WEP key, so no need to capture 50k ivs in a single session anymore.

Install version 0.3 from post no 1. in this thread (or any other working version), then apply my update. As per usual, make a back-up copy of the files to be replaced (Main.py, FAS.py, getinfo.sh, scan.sh, getmacmanaged.sh, getmacmonitor.sh, wepcaplist.sh, wpacaplist.sh, keylist.sh, john.sh), copy the archive to the FAS directory on your N900 and extract within xterm in the FAS directory.Enjoy

Note: Reaver and Walsh will be added in a future release, at the moment I am waiting for these tools to mature on my setup.

Note 2: Added screenshots to show new functionality / changes to previous version.