Not sure if this will help
One thing that actually helped me get comfortable climbing in runners was to actually go out and climb in them in a safe-ish environment
i.e. go bouldering or go rock climbing in them, it makes sense b/c over time one develops the feel of the shoes over the rock, honing confidence, abilities, balance and feel on the rock.
Also, imo, having runners compared to boots can help in situations where one might have smear or rely on mobility of ankles to help with balance issues (as opposed to boots which are great for edging but can be difficult to use in balancy situations...kinda hard to explain.)
If you are going to need to jam your foot in a crack, runners or boots work well, though again, imo, b/c of the ankle mobility in the runners will make it easier to 'feel' the jam.
It really depends on what one feels comfortable with, if in doubt about the really steep sections get yourself a pair of lightweight climbing slippers or shoes.