Starting with 2.3.x stepconf looks at the timings and base_period involved, and it decides if it should generate a doublestep config or not, doublestep gives one step per period instead of one step every other period.
Can I import my Mach3 xml file into the StepConf Wizard?
Yes, starting in 2.7 the Stepconf Wizard can import a Mach3 configuration of up to 4 axes.