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If they are rusted then the screws won't be stainless. Well they migth be A2 grade stainless where they can tarnish and bleed a little but not rust.

Stainless screws are soft and the heads will round off easy if the correct fitting screwdriver isn't used. The softness also means they'll drill easy so a decent drill will take the head off no problem.

Sounds like they are regular steel though so you only option is to drill them off. You might be able to get the head off with a dremmel type multitool with a cut off disc but unless your carefull you can easily damage the soft aluminium rail. I'll get a decent drill and drill them off. It's not too bad as I did it on my abbey last year. Once the head is off the shank is easy to remove with grips.

I can recommend the cobalt ones from here : http://www.ukdrills.com/

I use them to drill off rusty bolt heads on marine engines and they make light work of 5/8" bolts so a 6 gauge screw will be a piece of cake.