Currently the only way to design a Map Pilot flight is within Map Pilot. We may add an online web based layout tool at some point.
We do not have "business accounts". We offer Map Pilot Business which is a version of Map Pilot that has all of the features included in the original price with no optional feature purchases to be made.
With Map Pilot Business you do not have to be logged in to use it (like you do in Map Pilot LITE). To use certain features though you do have to log in with your Maps Made Easy credentials.
I can see that your account has been making data requests so you likely already got this figured out. Good work!