User blog comment:Zelron/The Thu'um (Waging War with Words)/@comment-4002748-20121104141639

If you play on PC, check out this mod: http://skyrim.nexusmods.com/mods/9286

It reworks a WHOLE bunch, but one of the things is "Speech" in the level up menu which now increase the power and duration of shouts. Shouting also levels Speech.

It's done really well, I highly recommend it :)