Please continue to add to the database! Your contributions have added a great deal and I've been adding plants to our database as you and others post them in an effort to make it easier. The last thing I want to do is discourage anyone.
A possible solution to multiple accepted names is handling them like we do Roses, where these names are all listed as cultivars. Would doing that be appropriate?
Here's an example:
Rose (Rosa 'Leah Tutu')