Some, although I think that would need either lots of slingshots or really heavy planets. If there are many closely spaced planets it could work, I think, and

Some, although I think that would need either lots of slingshots or really heavy planets. If there are many closely spaced planets it could work, I think, and the encounter cadence would be high. If there are lots of planets in closely spaced orbits I'd think orbital resonances could force planets into elliptical orbits, which would drive strong tidal heating, as on Io (but more so, due to the much stronger gravity of the primary.)