[Caulfield]

SP to RP:
every game they pitch (but not as a starter) I reduce stamina by 4 until they are at half what they were when they were a starter
(so a SP w/99 stamina will end up w/47 stamina & a SP w/66 stamina will end up w/29 stamina - I don't change other attributes, FBOW)

RP to SP:
I do the reverse until he has doubled his stamina,
but I go up by 3 instead of 4 (so a RP w/20 stamina will end up w/41 stamina
[obviously not a viable candidate to be a starter - need to have a mininum of 28 to be anywhere near a starting pitcher]
& a RP w/33 stamina will end up w/66 stamina. I'd need a reliever w/40 stamina to have good starting stamina)

IMO it should be more difficult to build stamina and easier to convert down to a reliever