I checked my ship i have Aegis set installed on it or maybe its the Breen Sub Zero set either way while looking at all the components you can right click on the engine and disable visuals. That should turn off that blue trail out the back of your ship. The shield indicator seems to be optional i just leave it on but like someone said in the options section you can turn them off.
The Deflector had no properties to let me turn off the visuals that i could find.
lol your right and wrong. yes you can disable the engine trails when you have the borg, aegis and breen sets but we are talking about disabling them when you have standard fed engines e.g. combat, hyper and standard impluse engines. Thanks for telling us what we already know.