looking for more space in the length of the short-url

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I use Shorties a couple of years, but the ‘fake directory name’ between website-address and shorty-name is a bit too long : 8 characters, ‘go’ is better » more space for the shorty-name.

But : if I change this in options, at some moment today, I’m affraid I loose the working of 8 x 15 = 120 old weblinks.

1. some solution ?
2. is it possible to enlarge the characters for the short-url ?