Modding

I recommend checking out a mod (unfortunately, I don't remember its name or author, but I use it) that adds a Necro-converter button to the global map and a Rage button in combat!

This is a mod by Xazardous; I had one (slightly modified): Xazardous_Combat_3.1_Rage&Necro_Button.h5u. The mod has buttons for the global map and in combat defined in the files [UI\AdventureScreen-Heavy.(WindowScreenShared).xdb] and [UI\CombatScreen-Heavy.(WindowScreenShared).xdb].
The file is old – from 2013 (and some other mods also affect the files [UI\AdventureScreen-Heavy.(WindowScreenShared).xdb] and [UI\CombatScreen-Heavy.(WindowScreenShared).xdb], and therefore the newer files will be used), and to make it work, you need to unpack it, update the file dates to a newer date, and then repack it.