First, to address your question:
"...therefore any pages I create for administration outside of the backend are to be considered manageable to any number of concurrent members as long as they are not backend or Administrator role users."
That is absolutely correct . If you create interface that , for example, allows people to submit news items and place this interface on your public facing website, your visitors would only need to be members of a role that has sufficient permissions for news. Since these visitors are members neither of the BackendUsers nor the Administrators roles, they will not be counted towards the limitation.
As for your comment regarding the speed of support - please note that this is a public forum, designed for the Sitefinity community to help each other. Our staff actively participates in it, which however does not mean that we claim any guaranteed forum response time. We try to be as helpful as possible, but if you need a reply in a timely manner, you can use our support ticketing system where turnaround times are guaranteed.
Grisha 'Greg' Karanikolov
the Telerik team
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