ambrus,
How do you think that could be implemented?
Given that I am not a devil - I have no idea how it would happen under the covers. I also wasn't too biased on the outside interface. You do bring up a good point:

as many people would just keep clicking Next until the whole database is searched
Again, I do not care how the functionality is acheived - even if it is nothing more than "add these node ids to my scratch pad/personal nodelet". I Just have found myself searching multiple times after discovering something I thought was not-important was later important.

So - if there is a way to achieve this functionality without the potential resource abuse - I would like to see it added.