Well, as I think I've already said... actually, that was in a PM, wasn't it. To go back and quote that:
I don't think I ever detailed the full extent of Steren's powers either, so... her telepathy is quite good at sensing or intruding into minds, but more limited in affecting them. (Sort of "Jedi mind trick" level stuff here.) Her biomancy is the more powerful of her focuses, capable of pushing her to wildly superhuman extremes of strength, toughness, speed, perception and endurance as well as reshaping herself in all manner of ways, but is essentially limited to "touch" range.
If we're assuming these "two groups", Steren therefore largely fits within the "self" one, although she can project her powers to some extent through touch. As she's already demonstrated, she can heal and regenerate the flesh of others, and I would imagine she could do some very much less altruistic things as well.
That said, I'm not entirely sure about breaking it down into two "hard" groups. While I tend to restrict a psyker within their focuses, I don't keep any particular rules for doing it and tend to customise it pretty freely to give them their own individual flavour.
One thing I have to add based on some of what has been said is that I prefer to disconnect the concept of psychic level and skill/control. (There's still a topic I wrote about some experimental psychic rules around somewhere, where psykers had to achieve both a power roll a la Dark Heresy and a control roll a la Inquisitor). A more powerful psyker can do things on a greater scale, not with greater skill.
As such, while Steren is probably "only" about Epsilon/Zeta level, she could mess with you unpleasantly on a cellular level if she got in contact with you. On a genetic level... if she had some time, yes. But in neither case does it necessarily mean she'd get it right though. While she's interfered with her own body on many levels, that's a process that's taken her many years and a lot of care.
Borrowed initially from Marco, although I don't see it as unreasonable for other telekines to have some form of object detection ability -- it's not all that hard to explain away as being able to "feel" where things are, or ought to be.
The "feel" was pretty much as I have it for Marco - it's part of how I chose to portray his "Wyrd" nature, in that his power is so innate and intuitive for him that his surroundings are almost an extension of his body, and he can feel where they are like a normal person can feel their foot.
But Marco himself is quite limited in what he can do in that he's only about Theta level or so, and can't normally apply more than a couple of hundred Newtons of telekinetic force at once.