Introduction to pan source hacking - application

In order to have $subject, I decided to look at the bugzilla and pick up 
interesting/easy (in my opinion) enhancements, even if very minor.

So I've started looking at [1] and here I am with possibilities and no certain 
  replies. Therefore, I'd like to get some advice. I believe I'm not very 
clear, so please ask away any clarification over the following questions in 
light of [1]:

1) Where would I put this kind of configuration?
+---------------------------------------------------------------------------
| x Add as stopped the download tasks whose filename match the following RE:
|         __________________________
|    RE : |________________________|
|
|    x Only if the list of added tasks contains non-matching filenames
|    x Filter NZB imports
|    x Filter imports from header pane
+---------------------------------------------------------------------------
I though Pan Preferences/Behaviour/Articles would be a good place, but this 
may break some kind of HIG concept. Opinions on the interface / the place ?


2) Shouldn't it be rather part of a more "download" focused tab? For instance, 
prioritizing small files or other download behaviour modification.


3) Is a regular expression well suited for that kind of operations? Or should 
it rather hold an easier to manage list of strings that would part of the 
subject/filename?


4) I'm matching a part of the subject, supposing that the filename in it ends 
with ". Is there a safer mean ?


5) Is pan/tasks/queue.cc the better place for this kind of filtering? I need 
to get settings such as whether the filter is active, the RE and such: would 
it be a good coding/architectural practice to directly retrieve this 
information, or should I create some kind of intermediate step?


[1] http://bugzilla.gnome.org/show_bug.cgi?id=343352

Thanks in advance,
Christophe GISQUET