It would be neet-o if the find function would not only search the word I specify but also the synonyms and other words closely-related to the specified word (ex: quick, quickly, haste, fast, fastest, etc.)

Another neet thing would be a toggle that searches for antonyms instead.

As DT will remain language independent (e.g. won’t include any language  specific dictionaries), this is currently not possible. But there are some similar improvements in the pipeline (using automatically recognized related words).