my suggestion is that when you have heat/cool selected, and you alt-click a particle, a small text box comes up (or console come up with coordinates already typed in) where you can type the temperature you want to set that particle to.
this would be very useful for wifi/ portal for setting large temperatures and speed up that whole annoying heating process.
sorry for the double bump, but i would like this idea to ba considered, also, when you click on something with the hotkey and shift, you get a line tool which heats (or cools the whole line. (it would be the same principle for the ctrl rectangle tool.) if this is possible, it would be awesome.