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2. Tagging is much better, yet one has to manage this system too, so you won't end with hundreds of tags on every single proposal
I really wouldn't agree for putting labels against proposals. But im all for allowing proposal owners to label themselves. I feel those warning flags will just naturally show up in proposals then us labeling them and discrediting them ourselves.3 tags planned for so far:
Red Flag - No further effort will be spent on Proposal - e.g. Originator is a con-artist
Orange Flag - serious doubts - MNO's beware
Green Flag - everything is hunky dory as far as PEC is concerned - all questions answered 100%
See Evaluator Guidelines example https://goo.gl/bIydYX