You can't go wrong using the approved signals. You can sometimes get into trouble using nonapproved signals. Here is what I mean.
When signaling a "no shot" signal, then just use that signal. Sometimes, officials just use a nonapproved signal of pointing to the ground. Trying to point out that the foul occoured, on the ground, before the act of shooting. Well... depending on how they signal this it could be interpeted as "Basket good"
I will use verval communication of "Move" to get players out of the lane. "Move" can apply to anyone, but if a player is in the lane and he hears "Move", then they should understand and get out.
I will use "Careful" not "Hands". If a coach hears "hands" then they may want you to call the foul as compared to prevent a foul. Again, "careful" should convey your message to the players that are involved.
Take this information anyway you want. Some may like it, some not. So far it has not gotten me into trouble.