these units were called RCM - or Radio Counter measures, generally they were Lancaster, Wellington, B-17, Stirling. The Idea was to fly towards a target and drop these "strips" to confuse the radar. One benefit is if the RCM goes one way, the bombers can go another and confuse the luftwaffe.
My biggest problem with RCM aircraft in aces high, 2-3 RCM flying on a front would confuse the hell out of everyone, thus would lead to problems - You wouldn't know if it was 30 aircraft or just 3 RCM in formation. It would easily be abused, only way I can see it is being perked.
Now in the Scenarios, radar jamming would benefit, mainly the Allies - being able to disrupt the interceptors, perhaps pulling some off the line to investigate, the only problem is there needs to be a strict limit of how many RCM are available.
As for night time, It won't happen, all one needs to do is crank his gamma all the way up and those RCM would be useless.