Hey man,
Sorry for the delay in replying; the prep for and execution of the
holidays has filled up my last week. I bought and installed the
PeepOpen application and tried replicating the issue you're
describing. It sounds more like an issue with the way MacVim opens
files than with PeepOpen.
It's possible that there's a better, vim-native solution to opening
the types of files you want to. I'd love to to talk it over either
with skype or in real life; I'm sure there's a solution to the pain
you're experiencing. I'd be interested to know what kinds of project
files you open with PeepOpen.
Thanks,
Veez