I've tried to incorporate the extra-Saturnine planets, though I think their meanings and powers are somewhat vaguer than the traditional planets - and that's the point. They are more shadowy, their meanings less established, empty vessels that can be filled with New Age bubbly or the Lovecraftian cocktails of Kenneth Grant. In the latter case, it should be noted, Pluto is of greatest importance as "Yuggoth", but essentially Kether in his Qabala.
In terms of magic specifically, I've narrowed down some basic powers that can be drawn from Neptune and Uranus.
Neptune is the planet of revolution, of innovation, advancements and technology, "Progress". Revolution can translate to rebellion, and it's trident symbol could be a Luciferian symbol.
Uranus is more about illusion and mysticism. Mysticism can either be of the lofty purified nature or of the ecstatic-erotic type (of course, this is a detriment, thank the prudes). The illusion aspect can be compared to mass marketing, the allurements of fads and such. Mass hypnosis and delusions. Unconventional forms of sexuality up to outright deviancy.
Pluto might as well be added as it in the same class - power, in the Machiavellian sense, but also wealth, and this being shadowy. Pluto is in some sense revealer and concealer, depending on sign and aspect.
The concepts above are really incomplete, but those ideas could be targets of ritual action. If one were to time rituals then one should consider the aspect of these in the chart, just as with another other body. I question the sign rulerships and dignities I have seen, as they are often different and I wonder if they really need to apply - but once it's in your head, lol, ...oh well.
If one were to just focus on their individual powers, then contemplation, meditation, make a talisman, etc. Given the lack of thousands of years of knowledge about them, I think one can be really creative with these things.
The associations of "higher octaves" of the inner planets I think is just a way to grasp and assimilate the new to the old in astrology, probably inspired by planetary assignments to fixed stars like Sirius or the Pleiades - which one can make talismans for BTW. It makes sense that Uranus would be the higher octave of Venus, but I have seen it assigned as Mercury. Likewise, Neptune as a higher Jupiter (which would mince with is being grafted on Chockmah by some) or Mercury, given it's somewhat chaotic influence. I know I have seen talismans for the three planets, but based on an interpretation of established tradition. Given the periods when these planets were discovered, (or dismissed as a planet altogether, as in the case of Pluto), it seems that there is much more flexibility of interpretation, but I have seen it to where they tend to dominate an astrologer's awareness.
