Your question shouldn't only apply to gimmicked tricks. Rather, it should apply to all of your props.
Let me explain.
Rule 1. The performer must be in control of your performance. A spectator should only touch props when you want them to touch the props and in the manner you dictate.
Rule 2. Perform in a way that shows the audience that your props are normal. Note, I said "show" not "tell." You don't need to hand them a deck and say "please go through the deck and verify it is a perfectly normal deck that has all of its cards, no duplicates, is not marked in any way, does not have rough or smooth edges and does not have any one way cards or tapered sides or ends." A simple, please shuffle the deck is fine. Treat the prop as being normal and they will not raise suspicion. In one effect, I use a one way deck. I have the spectator shuffle the deck, add a packet to the bottom when they hand it back, spread the packet and comment "looks like you shuffled them pretty good." Another spectator then selects a card from a table spread. The spectators have seen the deck shuffled and seen that the cards are different. They won't ask to see the deck because you have established the (apparant) fairness of the procedure. Don't make a big deal about it either. If you make a big deal about it, someone will ask to shuffle in a way that won't work.
Rule 3. Don't create a challenge. Most magic is designed as "look what I can do and you can't." Add a layer of nonsensical patter ("the sound of your fingers snapping makes the card come to the top of the deck") and spectators can't help but want to knock the performer off their pedastal by trying to figure it out. If your present magic with "say-do-see" presentation (where you say what your are going to do, do it and then tell the audience to see the result) the focus is on what you are doing with the props so is it any surprise that the audience focuses on HOW you are doing what you are doing with the props?
Rule 4. Set up and eliminate all possible explanations. This is Tamaritz's theory in the Magic Way. If you presentation leads toward one explanation and then you disprove that explanation the audience is left amazed. This goes to how you structure your performance and is very much in line with Rule 1 and Rule 2 (you show props when you want to).
Rule 5. Be entertaining. If you are entertaining, nobody cares how you did it. They just enjoy the illusion.