I’m in the midst of rolling out PHP Pear module 1.6, which has the beginnings of support for systems with multiple PHP versions (this is still new and maybe incomplete, but it at least has some awareness of php versions now).
Oh, also note that this is one of the Virtualmin/Webmin modules that has recently been made available on github.com, so you can easily fork it, extend it, translate it, fix bugs, etc. and send us a pull request to get those changes merged back in.