Semi-off-topic profession-combining stuff in spoiler..
I just find myself thinking that if Toady grouped or bundled any professions there'd be an immediate response asking for the original format to return.. For instance, I don't see much of a problem with combining pottery and glazing, probably since I've never used it, but I see conflict starting up if you tried to set up two or more dwarves on combo-pottery/glazing, there would be no way to force one dwarf to only craft pottery and another to only glaze (besides setting up the workshop profile to deny all dwarves except that one, and this method would take more time over the course of a playthrough instead of just having separate professions for pottery and glazing.. Same with sticking stone detailing in with stonecrafting.. or potentially turning all the social skills into "Business Sense" and "Social Skill"..
For gelding, I imagine that Toady has the complete version of the final, fully functioning 'animal caretaker' in mind.. By then it sounds like they'll be as important as your fort's doctor, providing medical care/food/water to any and all injured animals.. I wouldn't want to risk the potential of my animal doc running off during war-time because he's still got 45 more cattle to finish gelding.. From what I've seen, "jack-of-all-trades" dwarves are total chaos as far as what they'll do in what order..
Its hard to draw a line between customization and clutter, especially when the game is so far-reaching.. I just don't think I'd want my animal doc training animals, or my trainer gelding animals, or my gelder animal-doctoring :> Its a nice feeling when you
know you've got a single dwarf who lives for nothing but a single profession, since they'll take care of whatever needs done as long as they're happy and sane..
Far as all that goes, I'd employ some dwarves as "nurses", if I were able.. They'd basically take over the non-lethal aspects of medical care (dedicated food and water delivery, wound washing/treating, transporting the immobile patients, morale boosts from good social skills) so the doctors were always open to perform serious surgeries..