i think i cloak is good idea it just need to be limited say like can't be cloaked when you using weapons or when using the after burner or when using trade lanes or jump hole or jump gates and give it a good power usage so people can't have them on all the time even if they arent doing the things listed above
another idea would be when your cloak is on your shields aren't
i don't see proablem really with the cloak rules they in star trek as pretty much put above
should cost a lot of money for such things like this and be hard to find
like nomad thing as that where it came from in the sp mode of the game
and as it was in the SP mode of the game there should be no reason to keep it out of discovery mod
and mybe the french being new to 4.85 can have a weaker less usefull cloak
just have a couple of different ones out there