There doesn't seem to be an ideal way to manage the PIX!
As I see it CSPM is great for creating the ACL's but it's slow when you have a large network, plus it doesn't support the newer VPN clients/commands although you can use the Epilogue to work around this. If you issue commands directly on the PIX they tend to get removed next time you approve a new config from CSPM. Also the currnet release (3.1) is the last release.
PIX MC is very new and supports even fewer commands! I can't even import our current PIX because of this. At least you can issue commands directly to the PIX without fear of them being over written. Wait for a release that supports more commands I suppose.
The best way I can see of managing a PIX at the moment is using PDM and direct command entry.
What are you experiences??
Thanks