ActionScript 2.0 :: Arbitrary Expressions In Function Calls?

I have several custom functions that I import as .as files, but I frequently have to modify them to suit projects, which makes standardization and version tracking harder.Is there a way to pass arbitrary expressions to a function when it's called? For example, if I write the function,

Code:
function foo(){
for(i=1; i<=1; i++){
trace(i);
}
}

would there be some way to attach an additional expression after the trace function during the function call? As in,

Code:

foo(do_stuff_here);

where the function would act as if it had said,

Code:
function foo(){
for(i=1; i<=1; i++){
trace(i);

[code]....

but without modifying the original function?I realize I could add an expression to the original function within a conditional, and toggle it via an argument within the call, but since I don't know what I'll add next, or whether I'll need it next time, this would become impractical quickly.