As Autocrit and Scrivener will tell you, I have a serious problem with problem words.
In that, I use far too many. It asks me to remove 284 'that's from my latest work. Ouch.
yWriter will find problem words, but I really wanted something that will highlight them as I'm writing. That (there's that that word again) could be considered an enhancement request, I suppose, but I discovered a work-around within yWriter that I thought I'd share.
I don't use Locations or Items. So, I've loaded the list of my worst offenders as Locations and changed the Location color in the current scheme to something I recognize.
POOF: as-you-type notification of your 'problem words.' This has really (another PW) sped up my remedial editing, allowing me to see at a glance where they are and how to revise sentences to get rid of what I can get rid of. People use 'that' in normal speech, so I have to be careful not to make all my characters sound like MFA grads.
I'm sure Items would work just as well, but I haven't tried that.
So, offered FWIW. Others may have other solutions, but this is suddenly (PW) working well for me.
Keep up the great work, Simon, but please no more fussing with the RTF export.
-Rock