It’s not a problem! I’m glad to have helped! 
There are two ways in which you should be able to access those:
The first way is via keyword-parameters.
You see, those scroll-bars are themselves DirectGUI components, contained within the DirectScrolledFrame widget, and thus take keyword-parameters as per usual. To pass parameters to them when constructing the DirectScrolledFrame, just prepend their internal name, followed by an underscore. (Note that this isn’t specific to DirectScrolledFrame; it is I believe fairly general to DirectGUI’s design.)
Something like this:
myScrolledFrame = DirectScrolledFrame(
# <parameters here as per usual...>
# Setting up, say, the vertical scroll-bar:
verticalScroll_frameTexture = "someImage.png",
verticalScroll_relief = None
# Sub-components of these components--
# e.g. one of the buttons at the end--
# are then accessed via another layer
# of underscores, and so on:
verticalScroll_incButton_frameTexture = "someOtherImage.png"
)
You should find a list of relevant keyword-parameters on this manual page, and by clicking on the links to DirectScrolledFrame provided in that list, likewise the parameters for the buttons and thumb.
The second way, done after construction, is to access them as Python variables within the widget.
As mentioned before, these sub-components are just DirectGUI widgets within the main widget. As such, they are often held in variables within the relevant class, and can be accessed as such.
Something like this:
myScrolledFrame = DirectScrolledFrame(
# <parameters here as per usual ...>
)
# Altering, say, the vertical scroll-bar
myScrolledFrame.verticalScroll["frameTexture"] = "someImage.png"
# Likewise, the sub-components of sub-components--
# e.g. the buttons at the end of the scroll-bars--may
# in some cases be accessible via variables within them:
myScrolledFrame.verticalScroll.incButton["frameTexture"] = "someOtherImage.png"
Hmm… You should be able to hide them, at the least. I’m not sure offhand of whether it’s possible (safely so, at least) to actually remove them.
It is, I do believe!
Something like this:
someScrollBar["value"] = someValue
or like this:
someScrollBar.setValue(someValue)
Note that you should be able to get the current value like so:
value = someScrollVar["value"]
or like so:
value = someScrollBar.getValue()