I share the view of the original post. It would be great to have an annualized TTWROR (the only feature I am truly missing about this great tool). It can be calculated as follows:
(TTWOR + 1)^(1/n) - 1,
where n is the length of the period in years.
This is the usual formula for CAGR, compare also the note and the link at the bottom of the following page:
I imagine it to be a small change to add the “annualized TTWROR” in addition to TTWROR which would however bring tremendous value for any long-term portfolio/ investor!
Maybe this is something worth considering in a future release? In any case, many thanks for such a great tool 
sunny