Flash required for theatre work

I realise this was a while ago (and you may have solved it by now) but a couple of things I've found:

You don't need a flash. I've taken shots of productions using just stage lighting with the white balance set to Tungsten, they come out looking like shots of a stage show in progress rather than studio portraits but I'm guessing you want that? I used a 120mm f2.8 from the back of the hall last time and the cast were perfectly happy with the results - they preferred them to those produced by an alleged pro who apparently turned up with a gigantic flash!

If the AF280T is anything like my AF200T the green/red auto modes will work with the K-m - handy for grab shots. Just beware of settings which require a larger aperture than the lens can handle, for example at 200 ISO the AF200T in red mode wants an aperture of f4, which not many short zooms can manage at the long end of their range.