This is how you can set color for ‘current’ item:

You have to use class li.current_page_parent:

#suckerfishnav li.current_page_parent,
#suckerfishnav li.current_page_parent,
#suckerfishnav li.current_page_item {color:yellow;}
#suckerfishnav li.current_page_parent a:hover,
#suckerfishnav li.current_page_parent a,
#suckerfishnav li.current_page_item a {color:yellow;}

And now how to keep homepage item of menu highlighted:

1.  In plugin’s settings disable viewing ‘Home’ item. From now on you are not going to need it.

2.  Create new page and name it ‘Home’ …or how you want to.

3.  If you want this page to be viewed as first you have to set order value of the page lower than other pages. Now the item ‘Home’ should be on the first place in your menu.

4.  Go to Settings–>Reading and set your posts page to be viewed by clicking on the ‘Home’ link. Now every time you click ‘Home’ item in your menu, you will get to your homepage.

5.  The last problem is the URL in the browser. It is viewed like this:

Probably you will want the URL after clicking on ‘Home’ item to be www.yourdomain.com without the ‘/home/’. This issue we can easily solve with Page links to plugin. You can get it here or install it directly via ‘add new plugin’ panel.

6.  The plugin adds option ‘page links to’ to the page’s options. Just type in your domain’s URL and that’s it. Multilevel navigation plugin’s Home item issue is solved.