Need MainWP Plugin Tweaked

I have MainWP installed on my main domain and I use it to manage multiple sites. If you're not familiar with MainWP, just know that it uses a special plugin that you install in your "child sites". That plugin basically communicates with your main site where you have the MainWP dashboard installed. There's one thing that I want changed and I'll be as detailed as possible. When you create a new site in the main dashboard, after you've already installed the plugin in the child site, you're asked to enter the "Administrator username". I don't like that because if you ever update your administrator username in one of the child sites, then you won't be able to log into your site from MainWP. Since the Child Plugin is already installed on the Child site, the plugin should automatically communicate with the MainWP and I should be able to choose from a list of Administrators on the child site. Or there should be no need to choose an administrator and when I tell MainWP to go to the child site's dashboard, it should just choose to use any existing Administrator. I know it's possible because there's a software called Website Remote which does just that. You can go from your [login to view URL] Dashboard and log into any wordpress site that has their plugin and there's no need to specify any administrator username. It uses the first available administrator. So I know that MainWP can be tweaked/updated to do that. If you're good with PHP and understand wordpress, you should be able to get this done in one hour or less. I expect to pay somewhere between $35 and $50 for this. I look forward to working with you. :-)