How to set the STOP card?

[kbat]

I would like to stop my run when a specific tally precision is achieved, i.e. saying in the mcnpx input something like
stop f5 0.01
How do I do it?

[SAnsell]

Given that you can only have a stop on one bin of a tally, I have never thought to use or implement it..... I would add it as an option...

Maybe add it to Tally.h as an extra line -- use format names to get stuff like f5 [So it gets the correct tally number etc]

Then to add it to a tally add a tMod option.

[kbat]

This feature would be especially useful for optimisation studies: it would help avoid simulating more than necessary incident protons for requested precision and therefore make optimisation faster.
Alternatively one can just insert an appropriate STOP line by sed, but it is not so elegant.