I'm sure that I'm "doing it wrong" but I just fake it by adding sub-categories for different funds (or stocks), so, for example:
2011-12-30 * Fidelity - 403b Dividend
Assets:403b:Fidelity:VBMPX 2.493 VBMPX @@
$27.42
Income:403b:Fidelity:VBMPX -$27.42
