It is possible, but it will probably not happen for three reasons.
1. Maintenance on Sigil and also FlightCrew is very, very limited at the moment due to lack of developers
2. The usage of type is not required, but recommended. The type only specifies the language the stylesheet is in to prevent the reader from reading unsupported stylesheets. The 'rel="stylesheet"' is more important in this case, since that identifies the file as a stylesheet.
3. It is not required and the main goal of Sigil is ePUB2 and thus not mobi or any other e-reader format.
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