SPIonic doesn't support macron and brevis. The short bar over [face=SPIonic]h(me/ras[/face] is a macron(which denotes that the vowel over which it is placed is a long one). Brevis is a sign that looks like an upside-down circumflex, which denotes a short vowel, or a short syllable in poetic notation.
2. -> pls. check the number
I thinks accents (as well as the length of the vowels) must be learned on the fly. (I'll have to work on the lengths again
) So I think you might well pick up those accents again. And, yes we miss macrons in SPIonic, but it isn't there.
Good luck for your Greek!