No offense Boby, but what levels are you often playing with? Higher level engineers rarely go afk in the middle of match, or don't have a good time along their run. Honestly, I don't see what you mean with them wanting to take your place. I know one absolutely fantastic engineer who actively despises captainig, and my clan has made a fantastic inside joke about it.
As for QTE's not locking you down, indirectly, I believe it would. People would end up focusing on getting a perfect QTE on a failing component rather than giving it a mallet and running to repair the next thing, which would, in the longer run, cost you the ship. Perhaps for higher levels, they might be able to disengage from the idea of getting a full repair with a well done QTE in order to repair a failing engine, maintaining maneuverability so as to not lose the ship, but less experienced players would keep on the component, going so far as to camp it for the QTE rather than repair engines, which would slow them down and lower their effectiveness.
As to no depth in the aim mechanic... You've never been on a Lumber, have you? Or really used a Hades, or mines? A lumberjack shot from nearly 3-4 kilometers is a lovely thing to behold, especially on a ship that is moving. Or maybe a Typhon, which is underused simply because it's not paired well with anything besides a Hades, and it's rather difficult to time the shots between the engineer manning it and the gunner attempting to land the extremely slow, extremely hard to hit with flak rounds. Meanwhile, mines offer something completely different, trying to utilize different ammunition types to get more or less range before the mine hits it's arming time and deploys. I cannot begin to describe the satisfaction of getting a Loch mine detonate on an enemy ship after you've fired it perfectly into their path.
Again, it might be a difference of opinion, but I think you need a little more time when to see some things out. Engineering can be fun and satisfying, but even I'll admit, some people find it boring. Same goes for gunning, where they might not feel like they can ever do anything, or else get annoyed at missing juuuuust that one shot. And the same goes for captaining, those who don't like the complexity and the difficulties of coordinating with a second captain, and would prefer the simpler side of things, like engineering or gunning.
Please note I'm not being hostile to you, or trying to be dismissive. Just giving my opinion on things, and how I don't see some of the suggestions as being healthy for the ships in Guns. I admit, having a tool that would assist camping would be a nice addition, especially since it'd be balanced because it slows your engineers down and makes them less mobile, and therefore unable to keep the ship alive. Hell, I suggested and posted a concept of such a tool ages ago, I may send it to you if I can find it again. The reason I mention it is because Guns is starved for content, and should the devs, after hell freezes over, decide to look at the forums to try and grab a few new weapon, tool or ship concepts, then I would rather there be something for them to look at. Post the ideas you have, please! People are going to poke holes in them, but that's what can strengthen them, not dismiss.