Besides (and remember - YOU started it) there are certain things that a nitro cannot match that makes electric superior for this low(er)-speed use:
Maximum torque (and a whole bunch of!) it at near-zero rpm - absolutely no spool-up required;
Lack of oily fuel drippings making the surface on which you drive (often as vertically as possible) slippery;
Quietness - I love the sound of nitros, but crawling very often requires you to be right on top of your rig. Nuff said;
Lack of idling necessity - Sometimes you don't just have to be on top of your rig, but climb/crawl/shimmy around and above it. This can take some time.
Ability to run 2+ hours on one "tank." NOBODY wants to carry fuel bottles through the woods. Some rangers and most environmentalists even frown upon it.
On the other hand, an electric motor system will never match the noise, the smell, the vibration of a nitro engine. However, it CAN match the smoke of one. Once...just once.