Module _parse_var_pair question

Is there a reason why the _parse_var_pair in the Template class does not use preg_match_all?

This means that I cannot do this in my module:

{images}
<img >
{/images}

..and later...

{images}
<img >
{/images}

Instead I have to make a separate data array for each time the pair tag is used, and usually it is not specified how many times the pair tags will need to be used in the template. Am I correct in this or am I missing something? Are there plans to switch this to preg_match_all in the future? Im on EE2.1 Build: 20100712

Thanks.