Much of Shariah Law does not come from the Koran at all.
Amputations and covering women (dress codes) are from other sources.
This is like the Catholic Traditions (which are not Biblical).
So there is no obligation to observe them.
Islamic God Alone philosophy returns to the Koran and interprets it in a progressive way, i.e. in its cultural and historical context.
There are other progressive movements within Islam.
We can only hope that these baby steps will gain momentum and that a non-violent form of Islam which is accepting of gay people will develop.
It cannot be too soon.