I'm not sure about any of the enhancements you are asking about, but there is some difference to ArsMagica. The Spheres and Rune system, as listed, is essentially a modified version of Loz' magic system that appeared in Unknown East. Something like what your after may have been added, but based on Zomben's post above, it doesn't look like it.
As far as other settings such as Modern Fantasy, sounds like John Snead's
Enlightened Magic might be the ticket.
But, hell. This is BRP. Mixing and matched and general bodging should not be that difficult.
SDLeary