[quote=@General Scales]
What about Psy-Warp guiding projectile attacks?
[/quote]
She'd need to learn an ability giving her the power to do something like that first. The co-op combo system will be based off of triggering your special skills at the right times to support each other and unless you can think of a way to utilise what you have already (such as forming a barrier behind an enemy to act as a 'firebreak', increasing the effect of Flare's [i]Fireball[/i] attacks) you'd need to come up with a new trait or ability to aid your companions.

Having said that, I've no problem with Psy-Warp learning a Guidance type ability which she could use as part of a combo with another player, and it would certainly suit her skill set to have something like that available.