Here's the deal. You need to separate the Save and Cancel buttons -- and the Save button needs to be in the far right corner, not the Cancel button.
Here is the screen I'm talking about:
If someone is using RTM's Share function and hits "Cancel" instead of "Save", the ***ONLY*** difference they're going to see between a successful "Save" action and a "Cancel"-ed action is the "task added" pop-up text.
I know this from personal experience, as if you are using a thumb instead of a finger, it is far too easy to cancel your action instead of posting it.
And the righthand corner is the "sweet spot". Any corner of any screen is a "sweet spot" because of targeting. You really don't want to waste the righthand corner on a CANCEL action.
Frankly, I'd rearrange that screen to be first cancel, then the plus-lines button, then the save button. That way, you've given the "sweet spot" righthand corner to the default action of saving, and you've put some space between the save button and the dangerous cancel button.
Please do this. As it currently is, you've got a bad user-interface bug there.
Posted at 1:07pm on March 9, 2012