I have converted parts of the DPL plugin we had on the MediaWiki Install.
I still want to add some variable, but will do in time.

the most importants options i did convert.
Converted:
category=
mode=

Converted but missing some code to actually DO stuff (ie ToDo)
notnamespace=
ordermethod=
order=
shownamespace=

you can use DPL for listing pages that are in certain categories.
For example you want a list of races that are in the System Reference Document only (so not BR races or Customs races)
then you would do as following:
[dpl]
category = race
category = SRD
[/dpl]
it will only display those pages that have BOTH categories

to view the list category style (with the alphabetic headers)
mode = category (default is unordered )

to see a working example of a category list style, then broken down in lists:
Races is a good example.