The issue with changing the depth of a tapered thread is that it changes the mating depth of the fitting. Go too deep on the threaded hole and you may not get a good seal.

Fusion 360 threadtypes

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Yes. Create a custom hole and add it to a hole file. This will allow the custom hole to placed in a model with the custom specifications and notes.

ExternalNPT thread Fusion 360

Fusion 360maleNPT thread

1. Insert shape 2. Insert relief angle 3. Insert shape tolerance 4. The shape of the rake face and the method of fixing the insert 5. Insert side length 6. Insert thickness 7. Insert corner radius

Inserts for turning – dimensions and shape of inserts are standardized according to ISO. The inserts, when mounted in a tool holder, are used for external or internal turning.

I'm using custom NPT thread for my one of my design. is there a way to change the standard thread depth/length to custom value ? pls. assist.

Fusion 360 NPT threadmill

I want thread length to be editable since i have different hole different thread depth. it is possible to edit the value something similar to Creo 9.0 does ?

The length (depth) of the tapered section is also editable while the 'straight drill' is set to none.  Just turn it off, edit the length, and then turn it back on.