Behind the Scenes at My House
My experiences so far with the Prime Time Adventures RPG.

Well, this usually happens in my studio apartment, actually. Saying "behind the scenes at my studio" was a little too pretension for me, gamer though I may be. These are some house rules for the game we've evolved so far along with little anecdotes on putting the abrogations and ammendments into practice (used as examples.)

Unofficial Optional Rule: Encouraging Supporting Roles
This rule has two parts.
Firstly, if you take a one screen presence for any episode, you're required to enter at least two or three scenes as a supporting character (another players' contact, for instance.)
Secondly, you can use the contact of any player currently in a scene to enter a scene with that player without having to spend a point of fan mail.
For instance, if my wife Hallie is playing her protagonist, MISS STARLA, I can enter any scene featuring MISS STARLA for free (not having to spend a point of fan mail) if I play one of MISS STARLA's contacts (in this case, let's say it's her friend, HORRENDOUS WILLIAM.)
So, while STARLA plays out a scene searching for clues to a strange object unearthed on Mars, she runs into her old friend (and opium supplier), HORRENDOUS. If John wanted to enter the scene as his protagonist, IVAN, he'd have to pay a point of fan mail. If he wanted to enter the scene as his own nemesis, HEINRICH VON GROBBLE, he would also have to spend a point of fan mail. But, if he wanted to enter it for free, he could use any other supporting character you'd established as a general member of the supporting cast.
(In conjunction with this rule, my group usually forces the Producer to provide at least two or three new members of the supporting cast per episode.)
Unofficial Optional Rule: Signature Business
I used an additional rule for this series, to suit my players' tastes. Instead of a personal setpiece, players could choose a bit of signature business. This is something that happens to the protagonist every single episode and always works pretty much the same way.
The catch, of course, is that the player must work this bit of signature business into every single episode or else the signature business fades away.
It's both a curse and a blessing. While it's neat to have some powerful trick you can pull off any time you like, it's a bit of a pain to work it into every single storyline.
For instance, John chose a bizarre one: Every show, he wanted to have a situation where his protagonist, IVAN, gets into a battle and almost loses... he wins at the last minute when some mystic power shows him the ultimate finishing move, usually in a nifty slow-mo sequence. John wasn't sure he could work a nearly-losing fight into every episode, especially since the producer is under absolutely no obligation to do this for him (it's always the players' responsibility to work in their signature business and use it or lose it.) Also, there was the problem of keeping it fresh - doing the same thing every single episode gets old pretty fast. John was aware of this, but felt up to the challenge. He used his signature business in a sparring match in the first episode and in a death-defying duel in the second (IVAN's spotlight episode.)
Hallie's signature business for her protagonist, MISS STARLA was a little easier. She just wanted a way to feed cool information into the campaign without having to do too much work. So she gave MISS STARLA random horrific visions every episode. It wasn't too hard to think up these visions, but she also tried to include the other players by having them add an element to each vision whenever she devoted a scene to one. That was pretty fun.
Haha! They call me Arpie and you can reach me at yokeltania@yahoo.com..