Writing to attributes is fine but for custom properties I ended up
with this little helper (I know the name is idiotic but I had no time
to think of a good one):

  __extend: function(element, hash) {
    return Object.extend($(element), hash)

then just do:

  property1: 'value1',
  property2: 'value2'

$$('a').invoke('__extend', {foo: 'bar'}) // adding "foo" property with
"bar" value to all "a" elements

P.S. special thanks goes to Matt Foster for advising to use
"Object.extend" instead of "for .. in"

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