Automatic dimension for simple geometery?

So if I pre-select, for example, a line and call the linear dimension command, then it asks me for the first point and so on.

But why doesn’t it just place the start and end points automatically, and then all
I need do is place the dimension or just press enter to have it placed as per the settings.

Same with angle dimensions, aligned dimensions and so on…

Everything seems to be in place for this, so why isn’t it hooked up? Or is it hooked up and I’m missing whatever option is needed to enable it?

I recall X-CAD for the Amiga had this option way back in the mists of time; it saved heaps of time when dimensioning a large plan (s)…

cheers
rabbit