i've got the DSPFX suite (not the one that comes with sonar2), and the delay plugin will only show up as mono (and un-pannable) if the sonar track is set to mono.
when i use the DSPFX delay, i set the milliseconds by putting the bpm into analogx's delay calculator.
but WAVES gives you the ability to set the BPMs and note duration in their delay plugin so there is no millisecond calculation.