I'm almost finished implementing AppleScript support in Script Bay. (for InDesign, Illustrator and Photoshop).
I need input from AppleScripters what extension they prefer to be the default when Script Bay saves the script (if anyone cares...)
You can let me know your opinion using this really short survey.
If you care to answer the second question about Flash and Fireworks support, that would be great too!
I'm not sure extensions are really a matter of opinion. The extension for scripts saved as text (should be UTF8) is .applescript; .scpt is only for compiled scripts. Compiled scripts are generally the best option; the decision to ship InDesign's samples as text was, IMO, misguided.