I think the purpose of the KGS handle was to help people find each other for the L19 Tournament that is ongoing. That being said, and despite the fact that I do not use anything but KGS, I see no problem with allowing fields from multiple Go servers, and for multiple accounts as well. For now, though, you could just use your signature space to show them.

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We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.

It's actually easy to add more of these. What servers are popular enough to make it worthwhile? IGS, WBaduk, Tygem, OGS and DGS come to mind; I don't know if we need to add all of them. We could also add a catch-all for other servers (e.g. you could enter "IGS: foo, DGS: bar, Tygem: baz"

I've modified the KGS one to allow for a bit more space so you could enter more than one handle (e.g. you could enter "calm, RabidKyus" in the box now).

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KGS 4 kyu - Game Archive - Keyboard Otaku