Repeating command options

I've been trying to make a number of customized commands, but I've run into problems when I need the command to repeat itself. I can get the command to repeat, but it doesn't retain the options I've specified when the command ran last.

As an example, I've been trying to string a number of arcs together in an attempt to create a revision cloud. I used the following command string:

Repeat;arc ;center;@0.2,0,0;Angle;180;

When I run this, it makes one arc with the properties I want and runs the command again, but prompts me for options again.

If anyone knows how to make this work, or even something similar with polyline, any advice would be appreciated.

Thanks,

Nick