Some trees from the mods DT has compatibility with grow even larger than DT's versions, such as BOP's 2x2 firs which grow up to 35-40 blocks while DT's only get to around 30 (as far as I could tell using bone meal and burgeoning). Heck, firs in real life can reach 60 metres. Just a suggestion, I think it would be great to have trees grow even larger.

Super tall tree structures are avoided for performance reasons. As time goes on and computers get better we may yet extend these limits. Thanks for the suggestion.