Creating AIR installer (*.air), unsigned intermediate AIR package (*.airi) as well as generating self-signed certificate is possible in IntelliJ IDEA via Tools menu, Flex group, Package AIR Installation File action.
In the dialog you should choose AIR Application Descriptor from respective combo box. IDEA will automatically add required SWF file to package. ‘Create…’ button opens another dialog that allows to generate self-signed certificate.
I was getting path related errors until I realized I could “Add… Files and folders to package”
However, I wish that the IDE would remember the paths I add and the location of my .p12 file between packagings.
k9d, it is already done in IntelliJ IDEA 10 EAP! http://confluence.jetbrains.net/display/IDEADEV/IDEA+X+EAP