It would be nice if the conditional build step allowed for an else block.

I don't necessarily want support for nesting those blocks, but in the case of boolean conditions, it makes a lot of sense to create an:
if {

} else {

}
construct in the job.

I realize I could make two conflicting (if equals and then if not equals) but having the two blocks makes much more sense.

Especially when users have multi-step builds. For example:

Multi-Step build:
1) make clean
2) if($PROFILING)

{ make -PROFILING=TRUE }

2) else

{make -PROFILING=FALSE }

3) make install
4) if ($GENERATE_DOCS)

{ ./generateDocs }

5) `some final step`