I've been a plastic surgery counselor (especially concerning Rhinoplasty and Revision Rhinoplasty) for 5 years and I can answer this question beautifully!
Basically, with FFS or even "normal" plastic surgery, the goal always seems to be to create a harmonious, softer image that aligns with percentages and measurements that have been proven most acceptable and admirable for each individual facial type. It may seem that reduction (jaw shaving, nasal hump removal, brow shaves) are normal among FFS and plastic surgery in general, but in "normal" plastic surgery, there are also some masculine or "strong" changes to be found - many males and females get chin implants for example, which tends to be the most successful surgery out of the list. In the "normal" plastic surgery field, if someone has a chin reclusion and needs an implant, girls are usually given female implants, and males are given bigger implants, but it really is all up to the individual face - chin implants are always carved to fit the face, not the sex.
However, with chin implants, a doctor can indeed carve the implant to have various features of a male or female chin. They can carve clefts, shapes, and angles into the chin to a relatively normal extent, and again, chin implants, from what I've studied (1,000+ cases) tend to have the highest success and realism rate out of all plastic surgery procedures.
Now with noses however, adding a hump to the nose involves grafts or implants, but because of the specific scar tissue and skin health of the nose, "adding" features that are considered to be oblong or disproportional to the nasal anatomy is usually disasterous and this is why, even in revision rhinoplasty, the goal is simply to restore a "symmetrical" appearance instead of an oblong one; it's just healthier and poses less risk on the nose, especially when it comes to necrosis. Quite frankly, females have the advantage of how male hormones will truly give them a more masculine facial bone structure over time, even the nose, chin, and other features, where males with masculine features may never look totally female without possible reductions, depending on the current severity of his characteristics.
Also, there's procedures like buccal fat removal (not often recommended by doctors, but I find that some cases truly need it) to give a more haughty appearance (can work well for both males and females), and overall, FFS isn't really an individual field; it's just what the doctors call it to attract the business of transsexuals. All of the FFS techniques you see out there were first invented for men and women who simply wanted more harmonious faces; it then branched into FFS without much alteration, just because the techniques really didn't have to change. Even in normal "male plastic surgery" (non-transexual), the goal is to have a more modern, symmetrical, Androgynous appearance, and this tends to be the realistic goal that even Trans should try for (it's safest; too much reduction of the nose, chin, jaw, or forehead can indeed be risky.)
