Aliases in fields are a nice way to use short values in place of longer strings, and they work well in forms. You can store a value of "H" and have it display "High" when the document opens. However, they are not so nice when you want to use the field in a view, for categorization as an example.
My idea is to have a @AliasLookup function that could be used to read the field definition on a form and get the full value defined for the alias. By providing the field name and form name (eg. @AliasLookup(fieldName;"FormName"), the function would go to the form, find the provided field on it and return the non-alias value.
This would be primarily (and maybe exclusively) useful in view columns, so it might be possible to provide only the field name and have the @function read the Form from the document as it processes the view.
EDIT: Added link to related idea (forgot to search first!). This idea is slightly different in that it proposes using the form design.