Just a thought on having one command give a sequenece of spells.
Have the necro have a hotkey with
/pause (cast time + recovery time + a little bit for lag), /cast <gem # of first dot>
/pause (cast time + recovery time + a little bit for lag), /cast <gem # of second dot>
/cast <gem # of third dot>
set up on their bar that has a key press associated with it.
then the eqbc command can be /bct necroname //keypress "hotbutton associated with macro"
that should in theory make the timing of the delays come from the necro eq session and chain their dots in a row.
Issue of course would come from dots not having same durations, but at least it can slap all the dots on at once to start a fight