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.
The silly thing is, once upon a time... I knew about this. I guess like 6 years ago, when I was first learning DRAW and thus exploring every single bar and button. With enough time, I forgot.
I meant to put an image in my other post but I'll put it here. It is the reason (THIS particular time) why I wanted an exact center. There have been many others. For this one, its because the "M" in the Gotham font does not come to a fine point. For most people, this means nothing. For laser cutting, I am frequently adjusting nodes for efficiency, performance, etc. and even just for the sake of some kind of symmetry OCD. I had already done it manually after posting initially, by drawing a line through the shapes midpoint and thus having something to snap a new node to. But now I have better way, a bit of code to play with, and a preferable solution for next time. Anyway, it was this:
Are you familiar with Dynamic Guides? It provides some very CAD-like capabilities.
For that sort of job, you could drag one of the nodes to the point where those two segments, if extended, would intersect.
My only familiarity with Dynamic Guides has been the annoyance of accidentally turning them on and not knowing what they were so that I could turn them off. That said, I did just mess around with them a bit. I was still having the issue of a new node not being at the perfect center of a shape, when created with the freehanded double click of the node tool, eyeballing the location I would guess to be the center. Unless I am using the guide wrong. Incidentally, I also checked out the Alignment Guides and that actually worked nicely. No matter where I create the new node, once I drag it up and near the center, it snaps into that 0.5 location and runs along the guide. However, I think I prefer the macro (or built-in function) to toggling guides on and off for this one effect.
(Side note. I can't figure out why, but the shortcut for DGs Alt+Shift+D does not toggle the tool, rather it opens a new instance of DRAW every time I press the combo... weird. It is the assigned shortcut for the guides. I can't even try to assign it to another tool in the preferences because when I type it in to find the conflict, it just opens another instance of DRAW again.)