Specify timestep to write

[DavidVonRueden]

Hi,
While using this tool, I have often found myself longing for the possibility to only write a single timestep.
Sometimes I simply want to check on a running simulations last time step, or have previously written out .vtus for previous timesteps and now want to write the remaining steps. Currently, it is only possible to write out every time step again. I think it would be a cool feature to have simple arguments like:
-latestTime
-newTimes
-time (specify a range of steps to write)
This is something I often use with OpenFOAM tools like reconstructPar (https://www.openfoam.com/documentation/guides/latest/man/reconstructPar.html)
I was wondering if you think this would be a good feature to implement?