Hi!
As a MSO2102A-S owner I can't recommend the -S option.
Onyl if you really need everything in one device or have extremely limited space
this option would make sense.
The poor man's sweep is possible, but the usefulness depends on what frequencies
you want to work. The usability isn't the best too. The manual can't show that in
detail, but if you need to change values often it's starts to become a pain.
Save the money and a little more and get a real 2 channel sig-gen.
You'll probably buy it anyway in the future (I did).
Cheers
Guido