Hi Eric
I have to confess I have never used the command line and so I went and tried it – I don't understand how it works – I can't seem to make it do anything

Can you explain a bit how it should work?
RealCADD is slightly unusual in how it deals with the size of objects. You have to draw the object first to the approximate size you want and then edit it afterwards to get it to the exact size you want. It's perhaps more usual to define the size before you draw it, or define the size on the fly as you draw.
This has never really bothered me personally and I have got so used to doing it that I don't even think about it. And it would be fine if the damn thing stayed where you drew it originally when you edit it – but it is really annoying that it doesn't
For instance – you want an arc 50mm radius emanating from the intersection of two lines. You select the arc tool and use Snap to start from the intersection of the two lines you want. You drag out to approximately 50mm and un-click. You then adjust the radius in the Edit panel to 50mm. The arc goes to 50mm radius and
stays centered on the intersection – as it should – happiness and joy
Now do the same thing with a circle (or a square) drawn from the centre and when you adjust it – it damn well goes and moves, so you have to pick it up and re-snap it to the intersection (or whatever) – not good – no happiness and joy
SO – I think the first and most important thing is to make circles and squares drawn from the centre behave like arcs. Because that is a logical expectation.
After that – well in the general scheme of things I think it would probably be better if you could pre-define the size of objects rather than post-define them as we do now. The existing Edit pallet looks to be the obvious way to do this if it is not too difficult in terms of coding,
So – for example – you want to draw a 100mm radius circle – you click the circle by centre tool and the Edit pallet opens (if you have auto-retractable selected – otherwise it is already open). It is pre-focused on Radius – you don't have to click anything or tab anywhere – you simply type 100 on the keyboard – move the mouse to whatever Snap you want to draw the circle from – drag and release. Et voila – you have a 100mm radius circle centered on whatever point you wanted it entered on – no more moves at all. Substantial happiness and joy
I think that is what Mike was wanting – and it seems to me to be the smoothest way to do it if possible.
Second best would be to double-click the circle by centre tool and that brings up a dialog where you enter the radius etc – and the hit OK and then proceed as above. But that seems to be unnecessarily complicated to me – though perfectly workable.
As I said earlier, apart from the circle and squares not staying put, the current system is OK by me – but I think for general consumption and acceptance it would be better changed. Just my view anyway ...
Cheers -- George