Thanks for Will on pushing this further. I learned that in Dr. Plummer does provide the utitly in rjags to pick up a BUGS model from the previously saved session. This is very helpful in that we can always save the model and update it for more iterations to get a more rigid result. So I update R2jags and make this utility availble, too.
In rjags, you do this (suppose your jags model is "jagsfit"):
In R2jags (see ?jags in R for more details):
jagsfit.upd <- update(jagsfit)
2 hours ago