Squid cache and https

Is it possible to enable https caching in 7.3 release?
For example changing squid.conf from a previous release or using our own ?
Any working squid.conf?
Squid needs recompiling in order to decrypt https (to enable MITM)?
I guess in this scenario we loose controlling squid from the web-proxy part of the web page
but we earn working cache (right now only 3% hit ratio versus >20% with MITM and a good squid.conf maybe with a rewriter)
Can we use 7rc2 to achieve the same thing?

It would be VERY usefull to have a way to re-enable https decrypting at the last version
even if it requires a little work on our part.

Any help- Howto?
Thank you.