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It's possible and easy to edit in block mode with Vim. The tricky part that I always forget is the fact that you need to use the Visual Block mode. You can enter this mode using the key combo:
<ctrl + v>
The mode should switch into Visual Block mode:
Once you have you're block selected, you can enter insert mode using
I
After making you're edit, use
Esc
and your block content should fill in. This is handy for commenting large blocks of code and in many other cases.