It would be nice to be able to add and delete a given number of restarts to each simulation when using job chaining. For example,
sim add-restarts <sim name> 4
would add 4 restarts to the chain for a given simulation. Correspondingly, sim del-restarts would delete a given number. You could also think about adding restarts by total walltime. i.e. say "add 4 days of runtime" and it would calculate the number of restarts from the walltime of the existing job.