As an extension developer, the process of installing extensions to sites is painfully slow. It would be nice to have a "I know what I'm doing" button that would allow you to upload an extension without having to go through the following steps.
1) Bypass the "repair"
2) Skip the "owner" information and extension information screen
3) Skip the release notes
4) Skip the review of the license (skip accepting the license)
Basically when you choose the file to upload, have an option to do the install and complete in one step.
This would save me many HOURS a year having to go through the manual screens for those items.