🚀 go-pugleaf

 > In vm-summary, if you have more than 99 messages, the columns are not
 > aligned properly: [...] since the extra digit bumps all the other columns right by one.

Just set your vm-sumary-format to say %3n instead of %2n.

 > I suppose it would be safe to assume that 1000+ messages is very, very
 > unlikely, but there could be an option to handle 1-99 or 1-999
 > messages so as not to waste a space if no more than 99 are ever
 > expected.

The discountinuity in output only occurs between 99 and 100 and
is not very distracting in any event.  I don't want to encourage
people to use VM with large folders, since Emacs' itself has
memory limit that may well make VM lose your mail.

 > Also, is there some way to get rid of the quote marks around
 > the subject line?

Just remove them in the vm-summary-format.