If not then I'd suggest using the remap manager. It allows redirects exactly like you're doing but it doesn't clog up the asset tree with assets. You can also export and import from CSV.
Not sure, maybe remaps can be created via a trigger?
Yea I would go with remaps as well. But don't think it's possible to create custom ones like that automatically, the trigger action and js api methods only allow you to create them off the current path the asset already has, so www.site.com/path/path1 to www.site.com/path/path2
Would be nice to add that as a new feature though actually.
I think what we really need is to allow users in Edit+ to create any remap URL like you can on the web path screen of an asset in the Admin interface. Currently you can only create it off the current path. We could have it configurable as well so that you can disable it if you don't want your editors to have that power.