What I do is tool copy into Wave lab. Sonars normalizer is missing all the critical control you need. You need to analyze the track first for example.
Your working blind. The other thing I don't like is it does not set it self in Db, it uses percentage?? WTF.
Normalize is more a function of a Wave editing program and is not supplied as a plug in but integrated into the software.
To apply it you are "rendering" the file therefore a destructive process that cannot be undone once the file is saved. Plug ins are more or less used in a side chain and can be turned on and off, So simply turning up the trim will do the same thing. But, because your working blind you can only guess at what your peaks are and manually look for them, therefore a wave editor makes the job much easier.