Docs for "Path (breadcrumbs)" args?

Are the allowed args for the Path(breadcrumbs) location bar documented anywhere? I scoured the manual but could not find anything. I like the args demonstrated in the DO9 preview document, but would like to tweak a bit more...

Look in the Opus 9 Release Notes.pdf file.

The “breadcrumbs”-style Path field is available in the commands list in Customize as Path Field (Breadcrumbs). It provides a hierarchical view of the current path, as you can see from the picture above. Each element in the path is a button that can be clicked to go immediately to that level of the path. Files can also be dropped on the elements. The arrows following each path element can also be clicked to display a popup menu of the contents of that folder.
If you click in the blank area to the right of the path then the breadcrumbs display will be replaced with a traditional path field allowing you to type in a path as before.
Several options exist for the Breadcrumbs location field to control the appearance (use these in the Args field):

o driveroot (this was in the previous beta but not documented) – omits the ‘My Computer’ branch from the field and goes straight to the root of the current drive.

o mycomputericon – displays the ‘My Computer’ branch as an icon instead of as text (takes up lots less space).

o size=++++ - lets you configure the size and spacing of items in the breadcrumbs display. The defaults are 13+1+4+4+4. For example, to reduce the size of the arrows by 4 pixels, specify size=9. The default values will be used for any omitted items (e.g. size=++++1 would set ‘textright’ to 1 and all other values would remain as defaults).

By default the breadcrumbs field's menus do not display hidden and system folders but the showhidden and showsystem arguments can be used to change this.

[quote="knightcrawler"]o driveroot (this was in the previous beta but not documented) – omits the ‘My Computer’ branch from the field and goes straight to the root of the current drive.
[/quote]

Hello! Do you know how to remove the first item, that one represented by a folder & containing "Desktop", "Collection", "My Computer" etc.?

[quote="abr"][quote="knightcrawler"]o driveroot (this was in the previous beta but not documented) – omits the ‘My Computer’ branch from the field and goes straight to the root of the current drive.
[/quote]

Hello! Do you know how to remove the first item, that one represented by a folder & containing "Desktop", "Collection", "My Computer" etc.?[/quote]
Isn't that what driveroot does?

See the second example at the bottom of the breadcrumbs section here:
nudel.dopus.com/opus9/page2.html#breadcrumbs

hmm, not exactly. Driveroot provides the whole environment, so i have to klick inside "My Computer" to browse the drives. Also it´s not a big issue, since i use regular Drive Buttons for that task, i´d prefer it like this:

Btw, now i´m using "MyComputerIcon,Size=8+++2+2" from the example, how can i enlarge the spacings, is it 10+++3+3 or so?

The icon on the far left is for the folder itself. It's not really part of the breadcrumbs stuff, you'd see it in a normal path bar as well. (It's also useful as if the breadcrumbs bar is filled by a wide path you can still click on the far-left icon to edit the path as a string of text.)

Sounds right. Experiment and see, and read the release notes or manual for an explanation of what the numbers mean.