BLF phone configuration

[Nichfgv]

Hello,
I am using BLF on T28P and it is working great, but...

But I'd like to use a number for BLF monitoring and another number to dial when pressing the button. Is it possible? This because I'd like to use random number as username, but still retain the ability to dial the internal number, so for example, mind extension 100 has username 8547363, I want to monitor extension 8547363 but dial 100 when pressing the button.
In the phone configuration we have two fields, one named "value" where I enter the extension to monitor and one "Extension" that seems to be ignored.

Is it possible?
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Leandro