It's not an odd request, and Sean answered a similar question a while ago.
Here is the start of the thread from his answer:

http://metis3.gmu.edu/cgi-bin/wa?A2=ind1106&L=MASON-INTEREST-L&T=0&F=&S=&P=7407


On Tue, Jun 18, 2013 at 1:44 PM, Chris Hollander
<[log in to unmask]>wrote:

> I'm not sure if this is possible right now or not (I haven't tried), but
> it would be interesting, and useful, to schedule agents according to a
> distribution. Right now when you schedule repeating, you tell it the start
> time and an increment, but what if that increment could be a probability
> distribution?
>
> The motivation for this comes from the need to have agents act according
> to a Poisson process.
>
> I think the way to do it at the moment would be to manually reschedule the
> agent at the end of each step... and to be honest, I'm not sure if a
> general solution in the form of an overloaded schedule repeating is even a
> good idea.
>