INSCRIPTORS DO NOT GET AN EXTRA GLYPH SLOT.

You do NOT NEED to be an inscriptor to equip glyphs, EVERYONE can equip Glyphs.

So far the ONLY benefit inscriptors get (above people without the profession) is a shoulder enchant slightly (very slightly) better than the faction-based shoulder enchant, and a few off-hands you can craft and equip (NONE OF THEM SHIELDS).

Picking up 5x inscription would have definitely been worth it if they were going to give everyone an extra major glyph like they said originally, but I guess they figured everyone in arenas would consider it a "required" profession, and so dropped that bonus.

Right now you are better off picking up 5x Blacksmithing (2 extra self-sockets) or Leatherworking (bracer linings), and only having 1 character be an inscriptor.