I don't have Jet DST ... assuming it is similar to Tunercat.

There would be at least 4 steps required:

1. go to Switches>Calibration Options: put an "X" in "RPM Limit Spark Control" (remove the "X" from RPM Limit ETC Control)

2. go to Constants>System Parameters: set the Extreme Fuel Cut / Resume RPMs to about 500 RPM above (i.e. 6600 / 6500) the actual limit you want (this is the Master Rev Limiter - it needs to be higher than where you want to set the Spark Cut Rev Limiter)

3. go to Tables>System Tables>Fuel Cutoff RPM vs Gear: set this table to where you want the Spark Cut Rev Limiter (i.e. 6100 RPM)

4. go to Tables>System Tables>RPM Limit Control Method Change Delay vs Gear: this table will control the delay (in seconds) in changing from Spark Cut to ETC (Throttle Cut) as the Rev Limiter (i.e. set it to between 5 and 10 seconds)

Try this at your own risk ...