You can create a request for the toolbar change in our Ideas forum, and you can also vote for the features that you'd like to see in future updates.
Sharon: Yes, I realised that after I posted.
Alec: I know about the arrow you're referring to. There's also a back key on my tablet which will get me to the home screen (most of the apps I have on my tablet use that key to exit). So, yes, we can get to the home screen, but PS Touch will continue to run in the background.
So far, the only way I've found to actually shut it down is to use the task manager.
As for centering a selection, I've posted in the request forum.
Thank you both very much for the replies