[eluser]m4rw3r[/eluser]
I've finally managed to find time to assemble the ON DELETE RESTRICT and CASCADE actions, they should now work.
I've only made a tiny amount of testing of them, so they are still experimental. But if you would like to try them out, download the latest revision of the source from github.
I will write some functional tests for RDM soon (I have unit tests, currently covering about 44% of the code, but functional tests are also needed).