re: scm shaper

My thoughts would be to have a look on their website,
Here in Australia its http://gabbett.com/products/spindle-moulders/

As for the two questions
A Tilting spindle is on most mid range moulders and allows about 30 Deg from 90 allowing you to use a parallel cutter over the adjustment range.

A Sliding Table is again as above and allows very accurate end grain shaping as an example of one application, but you possibly already know this already as you already have a shaper.