New admin page to quickly change stock level

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Have dropdown listing all products and a button to decrement inventory by one and a text box and button to reset the value to a specified value. Have this page in the menus right below "Manage Products" and in such a way it can be bookmarked.

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Create new admin page: https://magento.stackexchange.com/questions/55943/creating-first-custom-content-page-in-admin-section

Create new admin menu item: https://stackoverflow.com/questions/28374544/magento-how-to-create-new-admin-page

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See also https://magento.stackexchange.com/questions/276891/magento-1-9-admin-form

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An example with form and form container: https://stackoverflow.com/questions/28464439/magento-adminhtml-how-to-create-new-admin-form

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And another form / container example with more explanations: https://www.smashingmagazine.com/2014/03/tutorial-create-admin-manageable-magento-entity-brands/

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Fixed by new Magento extension: QuickAdjustSock