Looking into the cycle parameter list for a Heidenhain UNIVERSAL PECKING (Cycle 205, DIN/ISO: G205) it seems like -from drilling operation customization perspective- all cycle parameters can be covered by extention of ootb cycles (by modification of the cdl file) with standard cycle parameters.
An example to extend the Drill_Deep system cycle with system parameters is described here
As a reference, look into the cycle parameters list for a "Single Moves" cycle (e.g. a cycle with chip removal) to see what could be added.
A couple of notes:
To specify a deepened starting point, activate the Rapto Offset (by Distance), this motion will go with the engage feedrate. The Feeds table contains a couple of relevant feedrate type, including engage, retract feedrates.