Will you support multiple attribute for select tag ?

I analyzed plugin file, but it’s not supported multiple attribute for select tag .

<select name="number" multiple>  <= here !!
<option calue="0">0</option>
<option calue="1">1</option>
<option calue="2">2</option>
...
</select>

Will you support it ?

http://wordpress.org/extend/plugins/custom-field-template/