Most of the wikis I've used have "minor edit" checkbox which you can check when you're editing post. When you check it, the edited post doesn't come back on front page after this edit.
Here we discourage minor edits, because "they are obfuscating front page", so there are many posts/questions/answers with tiny bugs (typos, punctuation errors, etc.).
Of course there are some issues with this idea:
- edits generate reputation point (minor edits don't have to - like they don't do it right now),
- edits require storage space - that shouldn't be a problem since edits are stored as diffs (aren't they?) so minor edits won't do a big change
Any other issues?