Android Soft Keyboard issues

I'm testing on a Nexus 4, Android 4.2.2, and having a few challenges getting the virtual keyboard to behave:

1. When a TextField gains focus, it always provides the return (newline) button in the bottom right, which successfully creates a newline in the TextField -- even though the TextField is set to single line, and I have restrict set to "^\n\r". How can I prevent the newline button from appearing, and if not, how can I prevent newlines in my single line TextField?

2. Is there a way to customize the action button (return key default) on the soft keyboard? Say to make it be "DONE" or something else?

-Aaron