So, with tails there's no targeted "get tail" transformatives but you can still get tails from using transformatives that are for a race which has tails. As for genitals on tails, voluntary cuntsnakes take the same shape and texture as the original tail, while Dicksprout can be used on tails (any tail, as far as I can tell) to add a dick to it. So basically, there's already ways to add genitals to your tail. If you want a pussy on your tail, use the Jungle Lure accessory to attach a cuntsnake to you. Note that this has to be done after getting the normal tail: If you have a cuntsnake tail, or if you have a cockvine sapling tail, you will have to remove them before using tail transformatives as they block tail transformations once they've bonded, unless that transformative is Foxfire/Frostfire (the kitsune/foxmorph tf).
Cockvine saplings override old tails, but cuntsnakes mimic the old tail and just add a pussy, effectively letting you just add genitals to whatever tail you want, as long as you have the base tail. For a cock on a tail, using a cockvine will just give a cockvine tail, though Foxfire/frostfire lets it turn into a fox tail (or several) with a cock and the Lucifer Candy Apple can let it turn into a demonic cock with decent amounts of use. For any other tail, get the tail first and use Dicksprout on a tail to get a cock on it.
It would be nice to have a system that allowed for transformatives to target effects on specific body parts rather than only doing full rng transformations, but if something like that were added (and honestly, if it were added, it would only be in the JS port once that gets out), I feel it would be better to do something like CoC2's alchemy, which takes existing transformatives and modifies them to be specialized/targeted.
Do you mean, like, one ages you up, and one ages you down? If so, I absolutely do not believe that could or would happen, as things have been written with absolutely no variance for age. Steele's age is one of the few, absolutely set in stone things that the player can not change, along with who Steele's father is or that Steele has a cousin who's their rival. So at most, the effect would be cosmetic, but at present there's nothing to represent Steele's visible age, no sliders or scales or things like that, and with so much content having been written for TiTS long ago, either there would need to be a ton of rewriting to include descriptions of how old Steele's face is or the visible age would never be mentioned in any scene and effectively would just not exist. If you want Steele to look old to you personally, then just think that in your head (and also change hair and fur color to be gray or white). If you want Steele to seem young to you... that seems kinda weird, but you can get your height down to 4' with Shortcakes and you can go lower with Goblinola and Ruskvel if you're willing to use racial transformatives. That's pretty much the closest you can actually get, because again, there is no variances for your age in-game, because it's set in stone and has been since the game's inception in... 2013, it seems.
