Looks like it's now more hidden because of bug 391945 I think that should be reintroduced as the message was already informing people about the problems and how it's not supported (they were aware of the issues but wanted to use it anyway). Hidding this setting even more will only cause noone at all will use it and, finally, it will probably die as nobody will care on fixing any bugs with it Thanks Reproducible: Always
This is done in commit 8199dee.
Thanks