Yes, this has been discussed before
yes it may be
Post builder or configurator?
Program & Tool path -> Machine Control -> Scroll & find "Feedrates" button, then click on it
Scroll the dialog down (if needed) to find the "Cycle Feed rate mode"
Set to the desired.
Note in the same dialog you may need to adjust the max/min values for each mode (e.g. I just created an inch post and IPR min = .1" (a bit big!)
This *should* convert whatever units you have in the operation to the units set in the post.
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled