I went with shoulderboards over sleeve stripes for the simple reason that sleeve stripes are harder to read at a glance for the newbie - and as a practical matter, for an RPG, it's a necessity to keep the pips, even if you don't use them on the *collar*, because they're used on the website (and switching is...difficult). Otherwise, it'd be more of a tossup, and I could see going to a whole new set of rank indicators.
So far as gloves - It'd depend on the uniform. For working uniforms, I see them. Duty uniforms, no. Dress uniforms it's sort of like headgear - you need to account for a multispecies environment.