which mib2c conf

Hi, I have to develop a subagent.
I'm not sure which mib2c configuration to choose. My mib contains a table
and the index is an INTEGER, plus other fields.
Table's entries are read-only but values have to be filled at run-time
reading an external file.

At first I've used "mib2c.array-user.conf".
The problem comes when I try to dynamically add rows to my table.
Is it correct create and write updated rows just before GET requests?

Is the right way?

Thanks in advance.

// hJ