So, implement the different effects yourself!
I've modded my stuff to make "passive EM scanning" by the Hyper-optics a lesser level of sensors that can defeat the stealth armor but not the cloaking device. All actual "cloaking devices" have level 5 in passive EM and so you must research another kind of sensors when these start to appear. It makes cloaking a much broader area of technology though the AI is not smart enough to know the difference and so this is mainly for human vs human games...
[This message has been edited by Baron Munchausen (edited 09 July 2001).]