Warhammers are as far as I know onehanded. So dual wielding warhammers is possible as is sword (Ok hammer) and board.
Why would you find them displeasing, and if you do so, don't play a titan. It's quite simple actually, they are made as bighammerwielding creatures.
I could imagine one as Thor from the Oots comic
Even so a warhammer does the same damage as a longsword, so I think it's a good choice to restrict a titan to this.