by kasca
As you point out in the text of your challenge, English aint your first language, so I wondered what you might mean when you say that you want to to make it fun for your 'employees'. Perhaps you intended to mean your family, but I couldn't help imagining a large room filled with rather unhappy workers hunched over their tiles and miniatures, praying for that set of new Hero cards with levelling up rules. Probably it was the wrong word in there but perhaps you would clarify as it jars a little.I suspect that a volunteer for your specific project is unlikely since, as chromaticdragon courteously indicated, while people do put a large amount of work into developing additional components and rules for this game system, they do so motivated by love of the game and for personal satisfaction and, more importantly, very much to a personal agenda.
My own feeling is that levelling above two levels, and even up to 10 levels, while it may be perfectly possible, would involve such a re-write of all the game elements that it would cease to be the game that it is and become a different game entirely. This new game might have an appeal of its own, but is likely to lose much of the simple appeal that the current system has. For one thing, to allow the characters to grow over ten levels implies a prolongued campaign rather than the one hour to 90 minutes that a game normally takes. And to make this balance would means something far beyond simply writing the new rules but would demand a period of play testing and rule editing at least equal to that performed by Wizards in arriving at the game we have. It is no small commitment.