For example, an option to add "keyword is", "keyword can" or "keyword + LSI" into the search etc to collect more relevant snippets. I am not sure if this is possible.
Yes this is possible, when you filter, you can use wildcard operators such as "*" and "%"
Update
KK commands a modest yearly fee. For that you get updates to the program and features.
I have added full spinner support for all popular spinners now.
You can now spin sentences and phrases that you select manually in the text window instead of spinning only what is detected as duplicate!