Same fence I assume. You have 3 choices:
Drill 2 holes but avoid the clamp rod that runs through the center.
Use double sided sticky tape, like carpet tape.
Make a saddle type fence that straddles the stock fence, either a snug fit or use threaded knobs on the opposite side to hold it in place, or use one of the existing bolts on the top.
Re the dust collection. Get a shop vac soon. MFD is essentially sawdust held together with binder, so sawing it just makes the worst dust possible. I use a shop vac on the sawblade housing which exits off the back of the saw. I also made a sheet metal bottom plate for the stand with a 4" dust collector port and between the 2 there is very little dust.
RE the sled. Just add a straight 1 x 3 about 24" long to your miter gauge allowing to extend about 6" to the right of the blade. Just cut through it when making cross cuts. This is recommended for any miter gauge. If you raise the blade to it's highest, just make the fence wider/taller so you won't cut off the new wooden extension.
Overall you will be very happy with the saw, as it has adequate power, the fence is self squaring, the stock blade is fine for general work, the new guard assembly on the 4100 is great. I really like mine and use it as a portable job site saw, but it's not my primary cabinet saw.