Yeah, I know what you mean especially with the %20's all over the place.
That can be fairly easily resolved by sticking with camel case for tiddler names.
I very much dislike camel case (cognitive annoyances) in my TiddlyWikis, so much so that I prefer live with those ugly %20's in links, to everybody else's very understandable chagrin.
Being an incessant Tiddler Title Tweaker (a 3T-er? a threeter?), I'm moving towards internal ID's as part of URL's, to prevent future link rot re distributed URL's (link rot caused by my "threeting".) Yeah, I coddle my sanity, or maybe insanity, and wind up perpetuating ugly URL's.
Let's say I get what you mean, but I've surrendered to ugly URL syndrome as the easier to live with evil. (thank goodness for the pretty links.)