I see this in the JSS paper
and even though not done here, could be implemented with resampling methods other than the bootstrap, for example cross-validation
I have been working on CV lasso with bootstrapping to provide inference statistics on the retained variables in python. I had the opportunity to switch over to R and glmnet (a relief) and found this package as a result. We haven't committed to switching to using R/glmnet yet, but if we do, I would be interested in contributing to the CV methods. My e-mail is in my github profile, if you're interested.