We are also capturing data from an 8-bit port.
For us, a useful feature would be logical operators on the trigger. In our case, trigger on nWR (not write) OR nOE (not output enable). So an OR of 2 channels would be good.
Another feature that would be good is to allow channels to be grouped, i.e. instead of seeing 8 separate channels we see one bus showing HEX data. The same way some simulation software can display it.