I don't think that's possible. The intention of a Remote Access VPN is that it can be initiated from virtually anywhere in the world without having to configure a group or crypto map for every possible ip-address.
You can restrict the times when the development team may connect to the ASA, but that doesn't prohibit them from making a connection when their not present at their own location.
I think it's better to place a VPN-device on the location of the development team so that you can be sure that they won't connect from a different location.
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Regards,
Michael