If you want an internal trimpot, taper doesn't matter. You'll set it and leave it. Even the value doesn't matter, as long as you have fine enough control to dial in the sound you want. A 10 turn 500k pot would be just as good as a 5-turn 250k.
If you want an external bias control, things get more complicated. Read
this recent post about adding an external bias control to a Rangemaster style circuit to see how I would approach it.
In the latter case, we're not really talking about reproducing a circuit anymore. We're in design territory now. Like I said, this is kind of an advanced topic, which means you'll have to experiment and make decisions about what you like best. The taper would be a personal choice. You might even choose to use a range of different resistors on a multi-pole switch to give you a few different presets instead of having continuous control with a pot. That way you would have no bad settings, and it would be easy set for specific sounds. External bias pots can be tricky to dial in. Unless you set them up very precisely (see the link) they can have large ranges of travel that are useless or even silent. You might be okay with that, or you might not. Up to you.
In any case, if you want it just right, I'd recommend doing these experiments on a breadboard instead of on a finished and already boxed vero. But that's just how I do things. Your approach is a completely personal choice.
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