I think the workaround for My Replies is to turn on automatic thread subscription in

>Settings>General Settings>Default Thread Subscription Mode:>Weekly with email

You should then be able to see list of all the threads you have posted on recently by clicking the SUBSCRIBED THREADS link at the top of every page

I haven't tested it but just turned that option on so will wait and see if it works.

You will probably have to put up with receiving an email once a week is all.