2. Using Theme editor or otherwise (eg Riscos command), can text colour be made to automatically contrast with whatever background the text is overtyping? (ie like Paint can use white with EOR so the result always contrasts with background)

ken

2. No, not really; you'd have to sample the desktop backdrop after it's been placed down (espcially in random mode), which is bad enough, but if you're using a mode that dithers the backdrop a lot that could result in some nasty stuff! It's certainly not a built-in option in RISC OS, and I doubt I could add it sensibly to the theme manager (it's not impossible due to the theme monitor being loaded all the time, but it's a bit icky).