Can't you just create a local inbox folder, then write a filter for each of your other inboxes to automatically move all incoming messages into the local inbox folder? That's what I do, and it works like a charm. For the rule, use something like "sender is not fslajlfdwoief" -- unless you know someone named fslajlfdwoief, of course.
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I think a simple filter can solve your problem. See my comment above.
Can't you just create a local inbox folder, then write a filter for each of your other inboxes to automatically move all incoming messages into the local inbox folder? That's what I do, and it works like a charm. For the rule, use something like "sender is not fslajlfdwoief" -- unless you know someone named fslajlfdwoief, of course.