I tried to look into your question briefly to see if there was a function you could call, something like mango.view.initPointDetails() or DataPointDetailsDwr.forcePointRead(dpid, callback func) from a server-side script, but I haven't met obvious success trying that. I doubt those functions prompt the modbus to poll, but I'm not 100% certain.

It's something to experiment with, if you feel so inclined. My intuition is aligned with Joel's, though: this is something that would take code customization to achieve.