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Yes... it can be done; the question is: now much work and with what tools?
There is the OSISoft Manual input application (cannot remember the name), or you can roll your own. We use three different methods to achieve these resuts, all of which use the SDK.
a web based application with a database back end and integrated security; users can only enter data for 'routes' assigned to them
spreadsheet based appolications that provides a controlled data entry environment with integrated security (SDK and VBA)
a generic spreadsheet that allows users to enter any tag they have write access to, the time and value; again, SDK and VBA
The tool Alex is referring to is called "Manual Data Entry" and can be found at vCampus Library within the Legacy DevNet Content -> PI DataLink Tools section. Please pay attention to the disclaimer.
No matter what mechanism you decide for, users don't need administrative privileges but read / write access to pi points they are supposed to edit. This is also true for the PI Archive Editor add-in to PI SMT. Please refer to PI Server (PI Data Archive) documentation with regards to PI Point Security.
You can also use PI System Explorer if you have AF client installed.
One important question is if you want to add snapshot values only. If so, PI System Explorer is a good choice since it is very easy to add new snapshot values to its attributes/PI Points.
Another important question is if the list of PI Points used to add values are fixed or not.
The answers of those questions influence which tools should you use or develop.