About the "send character and wait" action part. It is not working this way. You need to add all these action parts within a cutscene!
Example:
1. Start cutscene
2. Send character TO XY and wait
3. End cutscene
Aye Thomas is correct here. Players can still interact with the game. The wait until x action parts are only pausing the actions in the action block they are created in, they do not pause the game / prevent the player from being able to click a new destination, object, item or character etc. To do that you need to use 1 of 3 methods.
1. use a begin/end cutscene wrapper (all action parts inside can be skipped with ESC key)
2. use a hide/show cursor wrapper (same as cutscene wrapper, but can't be skipped)
3. create an overlay interface that is the same size as your default game resolution & show/hide as needed - doesn't hide the cursor, but prevents everything underneath the interface from being clicked on.
I should think using openGL shaders on iOS/android games wouldn't be the best of ideas to begin with. Handheld games need to be well optimized & kept as small as possible. Shaders will eat into the available system resources.
Hope the solutions mentioned by Marvel and AFRLme will not get you into too much work by ading then to each action where you used the "wait for..." stuff. 
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