No. The full ID will be like this:
id="<whatever-you-put>xx"
where xx is the resource ID for the link item. So if you put "&rowIdPrefix=`list`" then you'll get list1, list2, list3, etc for every menu item, but it will only get used where you have [[+wf.id]] placeholders. So create a chunk tpl for the outerRowTpl something like this:
<li [[+wf.classes]] [[+wf.id]]><a href="[[+wf.link]]">[[+wf.linktext]]</a></li>
The other rowTpl and innerRowTpl would not have the placeholder.
Then in your CSS you can style li#list1, as well as all of it children: li#list1 ul li, etc.