Alright, I'm no luthier so this might be a bad idea 
From what I've read, roundwound strings will do short work on a fretless fretboard. Jaco never practiced on his fretless because of that. And his fretless was lined, sort of..
Why not, instead of wooden markers, use metal ones? Think of them as sub-frets. They shouldn't affect the sound or the feel, but will definitely greatly enhance fretboard durability.
Of course, this is only possible with a lined fretless.
I wouldn't be surprised if this was commonly done already.
Anyway, what do you guys think?
Bocete
From what I've read, roundwound strings will do short work on a fretless fretboard. Jaco never practiced on his fretless because of that. And his fretless was lined, sort of..
Why not, instead of wooden markers, use metal ones? Think of them as sub-frets. They shouldn't affect the sound or the feel, but will definitely greatly enhance fretboard durability.
Of course, this is only possible with a lined fretless.
I wouldn't be surprised if this was commonly done already.
Anyway, what do you guys think?
Bocete
