I'm no guru, but I'll give you some reasons why not. Here's three off the top of my head:

• Soft references are global
• What if $var1 == 'con' and $var2 == 'fig' - and $config is a very important variable?
• What if a later programmer (like you?) wanted to add a variable named $config later? He would have to check to make sure that 'config' was not a valid value of $var1.$var2

Don't just listen to me (or sauoq or fruiture or Abigail-II above), go to http://perl.plover.com and read what dominus thinks of using a variable as a variable name - Part 1, 2, and 3

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