WinTasks Pro 5 might do what you want.

It now includes a script language so you could possibly produce a script to raise an alarm when CPU usages goes above a certain level.

Not sure how easy the script language is to use though.

See: Sample Scripts for WinTasks at http://www.liutilities.com/products/wintaskspro/whitepapers/paper9/
The built-in scripting language in WinTasks 5 Professional can be a very powerful tool. On this page, you can find a collection of sample scripts.

Sample Script #1
This script will decrease the priority of Internet Explorer if it uses more than 30% of the CPU.
 
  if process_file = "iexplore.exe" and process_cpu_usage > 30 then
dec
endif

Just a shame it seems to be my ass that gets kicked a lot.

I set up like this to allow me to separate out Audio, video and graphic apps so that they can run without virus apps (no internet) etc., and avoid all the usual crap that accumulates under Windoze and slows the system down. They all share the same Temp folder and PageFile too, and data storage is common to all installations.

Trouble is that even though I spent hours planning and setting up my ideal system, I still install almost everything on drive C: too - so day to day stuff still runs like swimming through treacle and my "ideal" parallel installations get under used.

Good in principle though ;)

Back on topic ...

I realise WinRAR has pretty minimal explorer capabilities, but I still personally find it unnecessary. I would prefer it is when I double click on an archive it simply shows the contents. The ability to move up to the parent directory doesn't really serve any purpose to my mind, and it gets confusing if you navigate about, forget where you are and start adding files to the archive.

OK maybe I am simple minded, but I would prefer to see the archive contents only (possibly with a tree view option), and if I want to add files etc. I just drag them in from Explorer.

It is possible to work like this, so I am being over picky probably, but it seems a more logical and less confusing approach to my simple mind.  :-[