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Thanks for the thanks. :)
The gesture I have found to be most resistant to accidental activation is Two Finger Pinch.
For the changing of the icon's appearance, you could use an Image Array script. With this script, you can assign a particular texture to the script and when the script runs, it replaces whatever texture the object currently has. So if you have two Image Array scripts, one with the right-hand texture and one with the left-hand texture, then you can switch back and forth between left and right icons when each script is activated.
Here's a JavaScript that makes a 'Materials' setting appear in the Inspector. By expanding the setting open and putting a '1' in the 'Size' text box, you can create an Element slot where you can pick a texture to assign to the script. The selector only recognizes Material type textures, so you will need to apply your texture to an object at least once (e.g on a test cube) so that Unity automatically creates a Material version of it that can then be selected and assigned to the script.
#pragma strict
var materials: Material[];
function Update () {
var mat: Material = materials[0];
GetComponent.<Renderer>().sharedMaterial = mat;
}
You use the exact same script for both the left and right hand icons, since it is in the Material section of the Inspector where you assign a unique texture to that script.
Here's an example of its use from my project, where I use arrays to change the phase of the moon each day from new moon to full moon and back again.
You could get SendMessageAction to activate this change by placing the SendMessageAction inside the same object that the array script is in and telling the SMA to look for a script that has Update as its function name (remember, SMA finds scripts by their function name instead of their file-name.)
