I made a couple of changes in the shower.
First we added a new shower head with an on/off valve like everyone else.
But I hate standing in the shower and trying to get the temperature correct while avoiding getting sprayed on.
And with the current arrangement if you open the door, you're going to get some spray in the bathroom.
So I installed this little valve right off the main spigot.
Delta Faucet U4922-PK Universal Showering Components
Shower Arm Diverter for Hand Shower, Chrome
I then threaded a small plain shower head onto this valve.
Not only does this allow me to get the temp right before I jump in, but it's
perfect for just washing your feet or your privates while leaving both hands free!
It's also useful for bleeding off that super hot water you get when you turn off the shower head for a minute to lather up.