Generate items with multiple arguments in an R documentation via roxygen2

To generate an R documentation file (.Rd) I use the package RStudio/Document option with R 3.0.2, Linux 3.11, devtools 1.5, roxygen2 4.0.1.

Objective

I want to describe multiple arguments of a function in the documentation file, such as in this example:

\arguments{
  \item{arg1, arg2}{Description}
}

Here, the arguments arg1 and arg2 are split by a space character. This leads to an automatic line break in the HTML version.

Problem

Using the RStudio/Document option, a space between the two arguments puts the second one in the 'Description' part, e.g.:

#' @param arg1, arg2 Description

will become

\arguments{
  \item{arg1,}{arg2 Description}
}

Inappropriate Solution

The only way I figured out to keep both arguments inside the 'argument' part is by not splitting by a space, e.g.:

#' @param arg1,arg2 Description

will become

\arguments{
  \item{arg1,arg2}{Description}
}

This is not wanted since with a greater amount of arguments the 'column' with the argument use a lot of space. I tried to escape the space with \ or \\ as well as to inlcude all arguments with \code{...}, but none of it worked as desired.

Question

Is there a way to create an output as in my Objective? Maybe some escape character that introduce a space?

Thank you.
Sven

It now seems to work with roxygen2 6.0.1:

#' @param arg1,arg2 Description

(no space after comma) gives

\arguments{
  \item{arg1, arg2}{Description}
}

(with space after comma).