To answer my own question...

It seems that the only way to change the size is via the theme engine. See
http://ubuntuforums.org/showthread.php?t=255065. Haven't found anything 
about TreeView expanders, though.

Walter Kempf wrote:
> Good day,
>
> I would like to know if it is possible to change the size of two 
> specific sub-components of a TreeView: the expander button and the 
> (vertical) scrollbar. The preferable way for me to do this is via a Gtk 
> RC file.
>
> I have Googled and RTFM'd, but all to no avail. Anyone here who can help?
>
> Thanks in advance,
>
> Walter
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