Frame – render – order

I havn’t found a way to do this yet so please correct me if there is a way already.
I want to be able to render frames in a nonlinear fashion.
In a framerange from 1-100 I want to render frames in an arbitrary fashion. this is one of the orders I would like:
1,100,50,75,25,12,37 etc.. slicing the current sequence in half and render the centerframe, and then iterate in that fashion until complete.
This way it would much easier to deliver accurate rendertime estimates and logs and it would be faster to see an entire sequence in its whole faster.