We need to parameterize our builds so that the user can specify whether to refresh-dependencies or not, which in gradle-parlor translates to the optional "--refresh-dependencies" parameters.
It would be really nice if you could specify true/false values for a boolean parameter. We would then create a parameter with true-value set to "--refresh-dependencies" and false-value set to "", and then just use $gradleRefreshDependencies when invoking the gradle script.
Our current workaround is to create a text parameter with the description "Please add --refresh-dependencies" to refresh dependencies. This is simple enough, of course, but the use case is ideal for boolean parameters.