In regards to decentralised exchanging using ACCT the introduction of CLTV means that malleability is no longer an issue (you don't need to refer to transaction ids that aren't already confirmed).

I have built code that will create a Bitcoin script that works by combining the ACCT and CLTV with a P2SH address and redeem script.

https://bitcointalk.org/index.php?topic=598860.msg13435766#msg13435766