Mixed code an style in WordPress forces Theme-Layout

Hi,

yesterday I found out, that wordpress uses in some functions tags which force the designer to use mandatory style elements.
In get_links_list(), used e.g. in my Sidebar, the return value is wrapped in <li></li> tags, which forces the designer to use <ul> or <ol> for the sidebar. I prefer <fieldset> to group my sidebar-items.
I changed the function not to return the <li></li> wrapper around the returned <ul>-list.
It is bad for a theme, when return values expect to be in a special environment as <ul>.
One problem with changing the functions behaviour is, that old themes will break. On the other hand it gives the designer more flexibility to format his theme.
get_links_list() is not the only function that return a <li></li> wrapper around the returned code.
Some functions even have ‘hard’ coded styles for headers for lists as <h2>.
I would suggest to clean the wordpress code, so that no styles are hard coded to wordpress functions. Functions that return a list should be changed to accept a parameter as how to format the header of that list(e.g. <h2>,<h3> or <legend>), possibly with a default value when no parameter is given.