There's not much to customise really - steaming-wise once it's up to pressure it's fine and has a single hole tip, grinder can be adjusted using the inner burr and the dial, you can buy single dose bellows and stuff too which help (if you're into that).
I mean that's part of the reason they might not be loved by the home espresso crowd, rather than it's a problem the machine has. It works for me perfectly well
There's not much to customise really - steaming-wise once it's up to pressure it's fine and has a single hole tip, grinder can be adjusted using the inner burr and the dial, you can buy single dose bellows and stuff too which help (if you're into that).
You can even adjust the brewing temperature too!