You can, but you don't need to...
Just mention in the readme file that your mod requires IA to be played !
In case of mega installs, you may be obliged to install IA in different steps to avoid incompatibilities (look at the BWP pdf). So as gamers usually install a lot of mods, there is a great probabibility that they have already installed IA.
Two years ago, when I ported or created more than a hundred of creature animations, I face the same question as yours : IA was a pre-requisite to my incoming mod. I finally gave up the idea to force the IA install when I realized that almost everybody had already installed it.
So I will just mention it in the readme...
Edited by Gwendolyne, 23 June 2015 - 03:12 AM.