This has been requested before but seems even more relevant since the advent of programmer monospace fonts with ligatures, few of which include an italic variation. In this case Sublime uses faux italics.
For example, I like Fira Code and want to use italics for keywords like function, let and var. With this font Sublime uses faux italics which look dated, mess with my OCD and screw up spacing when mixed on the same line with non-italics. Other editors support specifying differing fonts for italic and bold type. It’d be great if Sublime could do the same.