"And is there any point in being able to enter up to 2 decimal places for the spread?" - I've seen brokers that gives quotation to 4th digit but the spread is fractional. I also have plans to connect FSB to ECN. I'm not sure that the spreads of all possible instruments are integer numbers.
Another reason is that possibly I'll fix the pip value in FSB / FST to 0.0001 (0.01). In that case a strategy with SL of 20 will work without modification on 4digit and 5 digit quotation. Now we have to change the SL to 200 for 5digit broker. In that case the spread will not be 15 like now but 1.5 pips.