We've discussed this in our triage meetings as I believe there are other tickets with a similar request. What you are asking for is nothing more then a page group that does not auto-answer. In essence, a page group does this but happens to go through the part of the dialplan that adds the appropriate headers to tell a phone to auto-answer. You would eliminate that. (If you happened to have phones that are not capable of auto-answering, then you would already have this.) The other things that may need to be added from a configuration perspective is if you honor their ring times or make that settable from the page group, and properly coding the calls so they don't drop into voicemail, similar to how calls in a ring group are treated.
If you're interested in exploring having this accelerated you can contact support to discuss the possibility of funding it. I suspect it will eventually get done based on our discussions, but the timing of that is in question, and it's not clear if that is something that would be added to the normal paging or to paging pro. (The decision would depend on what's involved and if any of the paging pro capabilities were desired in the implementation).