They could definitely play around with glyphs a bit more.
The current selection of glyphs is a bit boring and unbalanced.
You could also add the one for attributes since you are here.
That being said, every time they add more options to the crafting, it is a form of power creep, and there are other aspects of the crafting system that I would much prefer seeing changed.
Power creep would be limited by (a) the fact that the glyph wouldn’t guarantee a specific result, (b) it would use up forging potential, and (c) it can’t be used on an item that drops with that resist already being at T5 or above. So at best you could only ever get a T5 with these, and that’s not guaranteed.