Hi Timspfd,

> Is there any way to make them stay?

Yup, it is possible to do that by setting up a script on a keyboard shortcut, see Petr's page here for the script:
http://kyticka.webzdarma.cz/3d/moi/#KeepCLine


> It would be nice to have them as a separate tool and when the
> tool was used they would stay until you removed them.

Check out this post: http://moi3d.com/forum/index.php?webtag=MOI&msg=1029.1
for a custom command that will do exactly that.

- Michael