20 minute time frame

My trading strategy that i have had for a long time uses the 20 minute candles, it was really disappointing after paying and joining the combine to see that i am unable to execute my strategy as I cannot use the 20 minute. Now im not sure what to do as i trust my strategy. Coming over from the combine using ninja trader where you could customise your time frame i hope that this changes otherwise i will not be able to use this product.