Well, playing (and mastering) a psyker in DH is fun, really. But I like RT system more, so I wish to use RT psy system - fettered-unfettered-push and lack of Threshold...

Well, I decide that by fluff Astropaths are something different as Sancionite. They really are some focused, and, that's matter, they can and must (must I mean as MUST, not "they should" or "they expected to" - they're soul-linked, btw) control their powers better.

So, this fluff abusing allow me to use DH rules for getting powers. Yes, Astropaths have lesser power list, and it's normal. They're narrow specialists. So, DH psyker can't use special Astropath's psy disciplines as Theosophamy or Soul Ward, and they can't use Astropath's talents as Rite of Sanctioning, Warp Affinity and so on.

A problem appeared with Minor Psychic Technics. First, they are wide. Wide even for DH. One psyker with Divination speciality can heal, levitate himself, perform Warp Spider with Space Slip and so on. Second, they're powerful.

So, I used this rule:

"There is no any “minor techniques” in RT psyker system, and some of minor techniques are not so minor. Space Slip is a good example.

So in this kind of conversion I use “General Techniques” concept. General Techniques are just useful tricks that can’t be put in any psyker’s Disciplines, so they’re unaffected by Discipline Focus, Invocation skill, Psy-Focus or other bonuses gained by skill and expertise. You can't meticulously use general technique. It’s just hastily formed raw psy power.

Any General Techniques can’t be used fettered."

May be, somebody is intrested.

I'm assuming when you say DT you mean DH. Dark Heresy, not Dark Trader my friend.

Yes, I'm very-very sorry.

IMO the RT/DW/etc system, while much more user-friendly (same standard d100 roll vs Xd10 against different TNs) is much less dangerous for the user. And it's that lack of danger that undercuts the reality of the grimdark 40k setting, where being a psyker is ultimate cosmic power at the potential cost of being sucked into hell every time you use it. As-written, Fettered and even Unfettered in RT and the lines following it…those options are just far too safe.

The DH rules for psykers represents the most radical view of the dangers of using psychic powers. No 40k supplement, novel or other game line ever made it out to be so completely and insanely dangerous to the user.

Given how the DH-rules psyker can obviate the rest of the party with minor powers alone (without getting into the sticky wicket of Telekinesis or how Ascension made it all worse) I don't see a problem with making those powers extremely dangerous. Even in later games, the things psykers can do are an order of magnitude beyond anyone else, and not just in killing power.