Tags are important
They are used for people trying to find questions, calculating badges, user activity, recommendations for users and suggesting duplicates.
We need to make sure that new tags added are actually needed and if they're not, they go, quickly.
Tags should be specific but not to specific.
However, there are no tags for the point releases - 14.04.2 would be pointless.
installation is too broad - installing a system and installing software are totally different things, and there needs to be the distinction in the tags. I'd suggest software-installation and system-installation - but then I'm active on Ask Ubuntu, and maybe there is a better alternative.
Tag edits are annoying and bump questions
There isn't much that can be done about the first point - yes it's annoying to review them but if they're improving the quality, they're not a bad thing.
Bumping questions to the front page doesn't help though, and the best way to avoid this is to edit when you see the question asked - not 3 weeks later.
Meta is the right place
If you want to know if a tag should be changed, if it's too broad or too narrow, if you want your tag wiki / excerpt reviewed, ask here. Make sure to tag it tags so people can find it, and respond well.
Synonyms can be asked here as well - for the mods to put through quickly. However, the current mods are the SE Community Managers, and so it probably won't be quick.