I am very confused of the grammars behind the phrases or words like problem finding, problem solving and pain killing.
I feel that rather than present participle, past participles should be used because the proposed nouns, like problem and pain, are the objectives of the verbs, like find and kill.
- This is a pain killing pills./pain-killed?
- This work is time-consuming. /time-consumed?
- He has good skills in problem finding and problem solving / problem found and problem solved?