It can be done. If you go into Administration > Url Manager and create a friendly url that points to the category view something like this:
mycategory.aspx maps to
BlogCategoryView.aspx?cat=1&mid=19&pageid=2
Now go into page settings for the sub page you want to link to the category and put ~/mycategory.aspx for the url
of course this is just example you will use whatever you like instead of "mycategory.aspx" and your cat= and pageid= will be different than my example.
Hope it helps,
Joe