@Ebongreen:
I think your suggestion is already implemented. There is a toggle at the bottom left corner switching between coarse and fine-tune mode. The latter lets you target at each single pixel ... well, not really, but certainly exactly enough.
@The Admiral:
The code, apart from having been syntactically wrong

, reflects my experience, not from one battle but from dozens (hundreds with mixed TFs). Anyway, the main thing is it is fun.