Has the Roche limit affect been observed having an effect on an constructed object gravitational wise to cause damage? Could the Roche limit be used to slow an object?
You have asked two different questions, Muze. The title of your question asks whether the Roche limit is dangerous to spacecraft, but the body asks whether the Roche limit has been observed having an effect on an object. The answers to these two very different questions are "no" and "yes".
The main question first: The Roche limit applies to objects that are weakly bound by self gravitation. A good example was Comet Shoemaker–Levy 9, which broke apart into a number of pieces before colliding with Jupiter in 1994. A prior close approach to Jupiter in 1992 tore the comet into pieces thanks to tidal effects. The collision in 1994 was a string of pearls hitting Jupiter.
Spacecraft are held together via welds, nuts and bolts, screws, and inter-atomic and inter-molecular forces. Each of these is many orders of magnitude stronger than is gravitation. The Roche limit doesn't apply to spacecraft as spacecraft aren't held together by gravitation.