I was asking for this earlier as well as it messup sorting but the dev think otherwise. So I decided not to use it at the moment.
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They think bump up sorting should be separated from regular sorting so viewers can tell which ads use bump up and which ads don't. In this case, as a customer stand point who use bump up feel sad because it reveals that their services/product didn't sell well and thus has to spend money to bump it up.
I do think this plugin is a big plus to flynax software. It just the logic does not favor paid customer. Not too many people want to see their ads is listed as a bump up. Most want their ads to be a top as a new, fresh ads. In my case many customers got confused by the sorting with the option Bump Up as well so I guess not using it would be better at the moment.
I paid to have that removed from memory as a modification as it was not required for a user to see that information, so yes the developer in my view has that part wrong as users do not need to see it was bumped up.