The particular property of the guitar, at least to my ear, is that it can easily "fill the room", as it were, even when playing simple chords or patterns. The keyboard seems to want... more complexity. But this doesn't work so well for, say, amusing people with ZZ Top covers at parties. To put it another way: Overdriven electric guitar can sound amazing while just playing power chords. Overdriven keyboards... not so much. It's bland. But start breaking the chords up, and suddenly you're making a piano arrangement of the song. Which isn't a bad thing, but isn't really what I want.
What playing styles or synth sounds might I look to work on for when I just want to rock the you-know-what out? Bonus points if it sounds great with heavy distortion. Double bonus points if it also works passably with a regular acoustic piano.
(An example of the sort of thing that I'm thinking of is the sound that Quasi's Sam Coomes gets with his Roxichord. Edgar Winter is another, at least some of the time.)
One thing I have found so far is that keeping most of the music in the lower part of the keyboard helps a great deal - which does make sense, as the guitar is a lower-pitched instrument.
Note that I'm not looking to literally imitate guitar playing on a synthesizer; that's silly. Nor am I interested in specific products. More, what are the basic principles that make specifically guitar-driven rock music awesome.