Oh Darlin, Use it!!!
I have a old Featherweight and it was designed to use. Singer's older machines were made back when they were used for making clothes so they got alot of use. I'd say to have it tuned up once in a while and keep it oiled and greased the way the manual says and sew like crazy!!
I have a treadle machine that I am slowly working on restoring and I want to learn to use it as well.
Its not only a beautiful piece of decore but you can use it too.
Have fun with it and enjoy!
Faith