I think it all depends on the engineer and his understanding of the problems you can get not just at commissioning time but later on in the movie , I have always used a staple gun in the correct areas and experience tough me to be careful, Although i do like to trunk were i can or aluminium tubing
This guide is the latest revision 2 2014 , Hope you find it useful , i will leave available for a couple of days, its to big to upload as a attachment 5mb
so here is a link
https://copy.com/w3juQkfVae0r
fire detection guide.pdf
ADT allowed the use of staples at some APC,s Manchester & Liverpool being 2 of them , Personally if used correctly and with care i approve my lads to use for fixing into soft building materials i.e Timber ect ect ,