Ok. But it is an interesting thread for me in two ways …
1 - getting a logic in TW that doodles dynamically easily (I think that was your main intent?)
2 - and, less commented on in the thread, but I find relevant, the aspect of hardware/software mediated input systems available.
Just a comment
TT
Well, the solution (or realization) that I bring up will do this. Incidentally a lot more also.
Please start your own thread. That is another discussion and even beyond the scope of TW.
It’s always mainly in scope given that TW is a bunch of things that basically can do anything a browser can. The Browser can use what an O/S offers so TW v. the rest is incorrect. TW is “in it” to an extent most webpages aren’t.
But I do get your point. That I segue maybe too easily. I simply can’t easily separate form from functions.
Philosophy over 
TT
Keep in mind the current thread is “Doodling is critically lacking in TW!” which is something others may wish to pursue. If you feel it is now about editor magic, perhaps rename this one, create a new “Doodling is critically lacking in TW!” with a pointer to the “Editor Magic one” or something similar?
I for one kept out of this thread for a while (for various reasons including time and time zone) but believe I have something to add to the original thread title. However I am reluctant to be the 45th reply.
Yes, that’s fine, but my comment was a reply to TT’s comment about him wanting to talk about “the aspect of hardware/software mediated input systems available” which is not about “Doodling is critically lacking in TW”. If you look at it in reverse; Anyone who does want to talk about “the aspect of hardware/software mediated input systems available” - are they going to find it based on the title of this thread? No, it is clearly better in a separate thread.
…and that is yet another reason why threads shouldn’t go totally off the rails.
On “Doodling is critically lacking in TW!” I agree but I would extend this to be
“Doodling is critically lacking in the world of software”.
I will not make this a big post by explaining this, hopefully its self evident.
That is, what I can do on my piece of paper, far exceeds any drawing application, but such doodles do not integrate with any software. Drawing itself is less than easy on most computer interfaces. The are some good attempts but we need one to “plugin” to TiddlyWiki.
Perhaps an interactive SVG editor, wikitext integration and an overlay method could get us closer to doodling Nervana, integrated with tiddlywiki. Such doodles could use the html elements to anchor on so insertions don’t break the existing doodles?
TiddlyWiki should not be responsible for providing solutions to every need we can imagine, but we can use it to embed the results, and ideally we can leverage another project with doodling as its focus and ideally bring it in as another editor, hopefully integrated with wikitext and images.