I think it would be interesting to have some maps that have a radiation source that will do slow damage to your hull, but is also filled with objects that can shield you by being in their shadow (like large asteroids). I could see zooming from one shadow to another trying to stay out of the danger zone being an interesting map mechanic!
I could also see when a dreadnought explodes that it could leave a radiation cloud, that if you dive into it you are shielded from scanners (gain partial cover from aiming systems or limit sight range etc) but also take slow steady damage to your hull.
Just some ideas!