No...
... the Ribbon does not display a Map Network Drive command if you select a share.
The Map Network Drive command shows up in the Ribbon when you select Computer. It does not appear in the Ribbon when you select Network nor does it appear in the Ribbon when you select a share in Network. Not sure if this is an oversight on the part of the developers or a limitation of the contextual tab feature. In any case, it seems that a Map Network Drive command would be appropriate on the Network tab.
However, there are very simple ways to Map a network drive. First, if you right click on a share in Network, you'll see a Map Network Drive command on the context menu. Second, you can add the Map Network Drive command to File Explorer's Quick Access toolbar. Just right click the Map Network Drive command in Computer and select the Add to Quick Access toolbar command. You'll then have access to the Map Network Drive command no matter where you are.
