so far I did not find the way to modify the setting for the catalog columns, by default, set to 3. Anyone can help on this? From the appereance settings on admin area there is not any option about it. 
I found the way and I write it here if somebody will need it in the future:
in “categories_pages/categories_multicolumns.tpl”
find
{split data=$categories size=$columns|default:"3" assign="splitted_categories"}
{math equation="floor(100/x)" x=$columns|default:"3" assign="cell_width"}
and replace the “3” with the desired value.
Oh, BTW, Smultron is GREAT!! for editing! 