Alternate path for shopping cart a good idea?

[Ollie]

A developer is working on a extension for me and he came up with an alternate path for the shopping cart. The path was changed from index.php?rt=checkout/cart to index.php?rt=checkout/cart_sp. Is this a problem at all? Any potential drawbacks with using an alternate path?

[Basara]

Hello.

As more changes you do to core features will be less compatibility with 3rd party templates and other extensions