Many users who disable cache (uncheck "Keep temporary files on my computer") do not generally expect temp files on the disk. It might be good for users to be able to select either:

1. Full caching as currently default.
2. Session-only cache mode: where cache entries are store in temporary cache dir under same structure as full caching mode, but temporary cache dir would be removed on VM shutdown (no warm-start benifit).
3. Strictly no-cache mode: that prevents files from being created at all,

Feasibility and priority of (3) is to be evaluated.

With option 2, session cache dir under TEMP dir, should be removed directly by shutdown hook or by a moping-up background process spawned on shutdown.