SimpleList questions from a beginner

Warning! I'm completely new to gtk-perl, with no prior experience 
writing gnome apps in other languages.  I've been using Perl-Tk for some 
years, though, but the amount of documentation to read for Gnome 
development is overwhelming.  And no, I haven't read it all yet...
Background: I've started writing an application which will have data 
stored in a MySQL database.  The plan is to use the TreeView widget for 
editing/navigation/selection tasks within this data store.  To prepare 
this part of the project, I've started playing around with the 
"simplelist.pl" example (from 1.00rc3), just to get familiar with the 
widget.
Question one: I noticed that I couldn't "push" an array to the 
SimpleList.  Instead, I had to push row by row.  Is this a bug, or is it 
meant to work this way?  Looking at the implementation, I would guess 
the same applies to "unshift"...
I would like to allow the users to move columns around by drag and 
drop.  I was able to change the example program to do this.  It wasn't 
even difficult...  However
Question two: What does the column indexing look like after user 
reordering of columns?  It seemed inconsistant to me...  When adding 
data to the list, the original indexing was used.  This is what I would 
expect, since the model shouldn't change by a column reorder.  However, 
the "editable" checkbutton in the program seemed to change the 
"editable" attribute of the first column in the actual visible table, 
not the first column in the model.  Is this the way it is supposed to 
be?  Is there a way to get around it without listening in to the 
drag/drop signals and keeping track of what the user has been doing lately?
I would also like the user to be able to edit a cell by selection from a 
(small) number of alternatives.  Something like an OptionMenu in a cell 
of the table.  From my (admittedly incomplete) reading of the docs, the 
way I'm supposed to do this is by making a customized cell renderer for 
the graphical presentation, and a customized data type for the actual 
data to display.  How to implement the customized data type is shown in 
the example.
Question three: Am I on the right track?  Does anybody have any example 
code for customized renderers I could look at?  Would I have to write 
the renderer in C, or is the class inheritance between GObjects and perl 
classes transparant enough for me to write my own class that inherits 
from Gtk::CellRenderer and take it from there?
Bjarne