Hi Rob. I run both track power and live steam, and both at the same time with no problems. Though these days it's mostly live steam and battery power when my girls want to run there track power trains there was no more track cleaning needed than when we run solely track power. Now there are a couple of provisos to this, and like anything that makes life interesting there is no "one size fits all", and long may life be that way
Firstly our railway is under trees and we have always have problems at times maintaining good conductivity due to insect "honey dew" (droppings) and nectar from the trees, so I have always wiped the track down with a damp thin sponge cloth wrapped around a piece of wood before any running session. And I generally still do this even before a live steam session so therefore there is never a lot of build up of any oil or other deleterious material on the track.
Secondly some live steamers are more generous with dropping steam oil on the track than others. My Regner is quite frugal on steam oil, dropping very little, my Accucraft Plantation is not to bad but my Accucraft Leader is very messy at start up. I have had a couple of Roundhouse Lady Anne loco visit and they would be on a par with the Plantation. Having a steam up bay where they can clear condensate, which is the messiest time, would be a great help.
Finally don't over oil your steamies running gear. I have seen one chap being very heavy handed with lubricating and there was some problems after than loco. But long term over oiling his loco won't do it any good either!
So I'd say go for it, but yes you may well need a little bit more work on maintaining track cleanliness than solely track power. But oh the smell and sight of steam - well worth the effort for me
