Basic mechanical control of a VNT with a boost can is INCREDIBLY easy. Yes you can make it so restrictive it wont start and yes you could screw it out so much you would never come on boost but if you understand the difference between what the 2 screws do and have an EMP set up then tuning is easy enough.
The only thing I would want would be either a better knowledge of the travel of different boost cans at different pressures or to be able to adjust the length of the VNT operation lever but that's pretty advanced thoughts really (although still not as hard as sorting a decent compound set up)
This is how a boost can works a VNT https://www.youtube.com/watch?v=QtqfNFnnps4
The only thing I would want would be either a better knowledge of the travel of different boost cans at different pressures or to be able to adjust the length of the VNT operation lever but that's pretty advanced thoughts really (although still not as hard as sorting a decent compound set up)
This is how a boost can works a VNT https://www.youtube.com/watch?v=QtqfNFnnps4