Add KeywordTest Parameter Count and dynamic execution via script

If I'm understanding your use case correctly, what you need is a way to pass arguments to an arbitrary keyword test dynamically during runtime. Something like:

args = ["param1", 15, true]; // params are read from a file
RunKeywordTest("TestName", args); 

This can be done in JavaScript/ECMAScript 6 and in Python.

JavaScript example:

let testName = "MyTest1";
let args = ["param1", 15, true]; // params are read from a file

KeywordTests[testName].Run(...args);
// This is the same as
// KeywordTests.MyTest1.Run("param1", 15, true);

The three dots operator "..." (aka spread operator) expands the "args" array into a regular list of arguments that are then passed to the .Run() method.

This way you can have a generic function to run a keyword test by name:

RunKeywordTest("TestWithNoParams");
RunKeywordTest("TestWithParams", ["param1", 15, true]);
RunKeywordTest("TestWithMoreParams", ["foo", "bar", "baz", "qux", "quux"]);

function RunKeywordTest(TestName, Args = [])
{
  KeywordTests[TestName].Run(...Args);
}

Python has a similar feature, array unpacking:

testName = "MyTest1"
args = ["param1", 15, True]

KeywordTests.__getprop__(testName).Run(*args)
# Same as:
# KeywordTests.TestName.Run("param1", 15, true)