I have it installed and I all it changed when it comes to symmetry, is showing numbers in place of the default symmetry icons (1R, 2R, 3R, 4R, 6R, 8R). Its context menu doesn't show a way to change it, either.
Anyway, the whole point of this topic is that we should have it in the official game because it's such a simple and useful feature that can't be done manually. And as previously mentioned, if we have 3-way, why not 5-way (and even more - custom symmetry)?