For anyone who is on Plesk hosting, or considering to move to Plesk, and is sad to miss out on all the wonderfulness that is Lua because of shared hosting restrictions and what not, don't give up but please vote for the following feature request:
Lua/Scribunto is not only incredibly useful, but may become one of few viable alternatives when Parsoid has made the move to parallel parsing and extensions like Variables and Arrays are no longer guaranteed to work.
Let's not 'miss the boat' and please make your voice heard.