Gadget I disagree that 'things get complicated when you mix styles'. Twenty years ago there was no such thing as one style or the other, John Bachar's death routes in Tuolome meadows cannot be considered as anything other than trad even though the only protection available are the (very few) bolts he placed.
At a crag we have developed, sport routes live happily right next to trad lines and (so called) mixed lines. The distinction as to how to protect a route is obvious and quite clear. A blank face or arete gets sportified, crack lines stay trad. If at all feasible the trad line is climbed pure with no recourse to bolts. Only in the (very rare) intstance of a five star route, of a grade accessible to most people, that has some extremely dangerous sections would we consider going the 'mixed' way, and then only after much argument and consultation with other climbers. Under no circumstances should a climber ever bolt an obvious trad line. Its just being selfish and pathetically mediocre, let alone being a complete waste of time and decent hardware that could just as easily have been used to create a worthwhile sport route.
The obvious confusion would set in when a large portion of the route is unprotectable by traditional means. In this case why not just bolt that section and create a mixed line? Purer ethically and a lot less work and expense. We have used as a rule of thumb, that if a third or more of a line has no pro then it should be a sport route, even then such decisions are usually only arrived at after much discussion with other climbers. Although I slam Kieth earlier in this discussion in his defense most of the routes were opened by him and there are few other active climbers in the Eastern Cape, however it still does not excuse his actions. Can one of his peers please take it up with him (Microbe?). Kieth dust off that rack and leave the noisy machine at home!
We have all become way too enamoured with our power tools and how effortlessly they place those shiny little metal brackets. Save the bucks you would otherwise spend on all these useless bolts and put it toward some trad gear, once you can do trad the entire world of rock opens up to you, and you can conceivably climb anywhere in this vast country where rock appears rather than just at a few developed crags. Derek Marshal has a point! Save the steel for accessible classic crags/lines that do not have traditional gear placements. But Ive ranted on about all of this before so enough mumbling, Im off to Oudtshoorn with a large box of steel in the boot!!! Later!
PS If I see any cracks I'll be sure to bolt them for you Kieth! (Kidding!)