Just have this question!
Why is compressed private keys not supported? Any problem?
~~MZ~~
When Armory's wallet format was originally created, compressed keys didn't exist in any Bitcoin software. I never accommodated for the possibility in the wallet format. Since then, the wallet format has been so thoroughly tested and battle-hardened, I didn't want to mess with it to support a non-critical feature like compressed public keys.
Finishing up a new wallet format now that will support a lot of new features, including both compressed and uncompressed keys. Still a ways off from an official release, but it's coming.