Should be very easy, but I lack node manipulation knowledge and couldn't find the magic code words.
I have to add here that there is a built-in way to do this (or something similar to this) in CorelDRAW, without a macro.
For some Curves, using the two different methods produces wildly different results.
If you select the Lead node and tap the + key on the number pad it will place a node exactly between the Lead node and the Following node.