It appears that LaTeX commands cannot be used on SE Linguistics, but they can on other SE sites. Personally, I wanted to use this feature a number of times to insert a formula and here's another question with the same problem. Expressing formulae can be useful when discussing things as simple as the number of combinations that arise from the different conditions in an experiment, or when discussing statistics questions relevant to linguistics.
Could we please allow the use of LaTeX commands? I don't think having this feature will be a problem for anyone not wanting to use it and it will help those who do.