In this meta.SE post is a neat functionality to stop people from creating new tags is described. Unfortunately it's not active on ELU. Fortunatly, Laurel has this brought to ELU attention over here in an answer.
This feature is currently enabled on Stack Overflow, Server Fault, Super User, Unix & Linux, Mi Yodeya, Ask Ubuntu, Physics, Sound Design, Pets, and Mathematics.
It would provide us with this neat warning:
Since it is already available on other network sites it should be relatively easy to activate it on ELU. I think it would be a great addition and keep senseless tags from being inadvertently created.