On dewiki my bot creates links to prepopulated forms, so that making wikidata changes is much easier.
http://de.wikipedia.org/wiki/Wikipedia:Qualit%C3%A4tssicherung/20._Juni_2014#Johannes_Lubahn contains a link "neues Item erstellen" to Special:NewItem.
My bot is also able to make sugesstion for aliases. You can see an example at http://de.wikipedia.org/wiki/Wikipedia:Qualit%C3%A4tssicherung/20._Juni_2014#Wilhelm_Wundt . But creating a prepopulated link for setting aliases is only possible for existing items because Special:SetAliases needs itemid as input (and i don't know the itemid if the item had not been created till bot run, of course).
Adding an alias field to Special:NewItem is the only possibility way i can thing of, so that users need only two clicks for adding them prepopulated to new items.
Maybe it makes sense to show this field only if the aliases parameter has given a value, so that the empty version is not getting more complicated.
Whiteboard: u=dev c=frontend p=0