Is your feature request related to a problem? Please describe.
As a guild, our DKP system uses the second highest bid +1. This is to automatically denote the highest bidder as paying more than any other bidder, psychologically assure the second highest bidder that they were lower, and conserve dkp where there might be large gaps between bidders in a silent bid.

Describe the solution you'd like
Add functionality that automatically adds in an increment the the second highest bid when more than one bid is present. This can be done by creating a new option in the Cost Auto Update Value dropdown and a dependent input field that the user designates the increment value by. Then whenever there are multiple bidders, the logic will automatically select the second highest bid and add the increment to be shown in the automatically generated Item Cost window.

Describe alternatives you've considered
To date, I have manually added +1 (ex: typed in 261 instead of the auto 260) for every item we've bid out. Yes this works, but it's the same argument for not even having second price bidding because you can just manually lower the automatically generated Item Cost down to the second highest bid.

Additional context

Thank you so much for filing a bug or feature request! You're helping to make CommunityDKP even better!

My guild uses this DKP method so I'm gonna try to wrap my head around some LUA and open a PR for this enhancement if that is alright.

To make it more flexible the +1 should be a variable, which can be set to any other desired value.