Options??? Does the options refers 4 disk breaks, climate control A/C and stuff? If so in given context, car will not loose any of those options.
However i've heard the fuel:air map of ViRS is more biased towards performance compare to normal Vi. So fuel map will be affected. But the functionality econo/sports switch can be achieved through your gear changing pattern? i.e maintain high RPM all the time or just change gears around 2200 - 25000 and maintain average around 2000. I guess if given the options, still better-off going for Vi ECU + gear box, instead of EG series ECU.
If there are other performance related options in ViRS you will loose them in both early EK series and EG series ECUs anyway.