The Apple IIGS ROM has 32 bit call tables, e.g.

CallTable
DC.L (TheEnd-CallTable)/4 ;num calls + 1
DC.L BootInit-1
DC.L StartUp-1
DC.L ShutDown-1
DC.L Version-1
DC.L Reset-1
DC.L Active-1

I can't find any way of expressing this. It seems there is only support for 16 and 24 bit address tables?