Question about making a mod. "Monkey Grip"

I have only a vague knowledge of modding, so I'm curious if it would be possible to make the following mod idea.

Basically adding a new ability similar to the Monkey Grip feat, allowing a character to wield for example a two-handed sword in one hand and a bastard sword in the other.

For now I just use Keeper to accomplish this, but it would be nice to do it in game and with the right benefits and disadvantages.