Allow search by non-name fields in Event app

Using the Marketo event app, the iPads at the registration desk can only browse / search by name, alphabetized by surname. We have a lot of registrants who sign up with their Chinese names, which are not alphabetized, and cannot be searched using the Roman character keyboard. It would be really useful if we could search / browse by non-name fields, ideally mobile phone number, but maybe event registration ID or some other field.