Okay, Adam's sin only affects the elect?Yes, and since there is no reason based on this context to CHANGE "all men" to "all INDIVIDUALS", I'm not really sure what your point is.
Again, all you're doing is ASSUMING your theology (aka "eisegesis").
Yes, and the CONTEXT of Rom. 5 (going back to vv. 1-5) is limited to the ELECT (those who have been justified, have received the Holy Spirit, accept Jesus as Lord, etc.)
And even if you reject that, it is very easy and natural to interpret "all people" as "all GROUPS of people", so again, all you're doing is ASSUMING your personal theology.