<#
    .SYNOPSIS
        Adds or updates a value in the active parameter collection.
#>
function Add-Parameter {
    param (
        $parameterName,
        $value = $true
    )

    # Add parameter or update its value if key already exists
    if (-not $script:Params.ContainsKey($parameterName)) {
        $script:Params.Add($parameterName, $value)
    }
    else {
        $script:Params[$parameterName] = $value
    }
}