It seems like the pre-master secret generated during the SRP protocol would make a good source to generate a shared private key using a secure hash to compress it down into a 128/256 symmetric key. The random values that get hashed into it seem to make it good for that purpose.
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From the RFC:
It seems from my quick look over the RFC that that shared secret is the premaster secret, so you are correct.
There is an explicit RCF 5054 which uses SRP to negotiate a shared key for a TLS connection. There are also hooks for OpenSSL to be able to use SRP to setup an SSL connection without using certificates using the SRP generated shared session key.