Is there a mod that would add one-handed spears?

from a quick 15 sec search which you could have done yourself:

hold your spears how you like: http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=8586
one-handed spears: http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=5466
one-handed spears plus halberds plus javelins: http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=7926