I think this is what the OP is asking about:
QUOTE (Spy Games, page 164)
Master of 1000 Faces
Cost:0.5
Prerequisite: Keratin Control, Facial Sculpt, Melanin Control
The Adept using Master of 1000 Faces power can change their physical appearance to any possible metahuman or ethnic trait with a few exceptions such as becoming cyclopic or growing multiple arms. It also allows the adept to change his height by (Magic + initiate grade) x 10 centimeters (minimum height of 1 meter, maximum 3 meters) or weight by (Magic + initiate grade) x 5 kg (minimum weight 60 kilograms, maximum 300 kg) in 24 hours. This change lasts (Magic + initiate grade) days. This transformation is taxing on the body, possibly requiring additional caloric intake (gamemaster discretion on additional costs for the change, such as lifestyle or clothes). The change can be completed faster, but causes 1 box of physical damage for every 2 hours reduced from the minimum 24 hours. If the adept is trying to resemble someone, it requires the Disguise skill and adds an additional +2 modifier to any Disguise Test in addition to the levels of Facial Sculpt.
Since it lists a few things that explicitly cannot be done (like extra arms), and states this in a way as to imply these are a few examples, I'd say gender is one of those things you cannot easily do.
As nartaki have four arms, and this power does explicitly say you cannot grow arms, that's a metatype you cannot fake unless you've already got four arms.
Auras are magical, and there's other metamagic feats that will let you change your aura. This power won't do anything to your aura.
The power does expressly limit your height and weight changes based on your Magic & Initiate Grade. Going from a troll to a dwarf is going to require a Magic + Initiate Grade of about 13 or higher just to reach the height requirements, and a Magic + Initiate Grade of about 48 to get the weight (figuring a 240kg difference from troll to dwarf, based on averages presented in SR4a, page 72). This isn't likely something a street level runner is ever going to be able to do.