I improved the keyboard functions of the boot-time scanner a little for the next version (the Alt/Ctrl/Shift keys should be ignored and the numeric pad should work as well, when available) - but I’m not sure if it would help anyhow in this case.

Regarding the deleting of compressed files - it depends on the type of the archive. For some archives, avast! is able to delete the files from inside of the archive. For some (only a few ones), it’s even able to modify the file inside of an archive (i.e. unpack, modify (e.g. repair) and pack back).