To hide the Budget and Role Fields in the timesheet screen see topic on User Preferences in particular the section on the Screen Tab
Keyboard Shortcuts:
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Press Tab to go from field to field, Shift + Tab takes you the other way.
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Using F4 or Alt + will open the lookup without using the mouse.
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If a field is highlighted, pressing your End key will put your cursor at the end of the line.
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If you press Tab to get to the
Add New Timesheet button, once it is highlighted you can just press your enter key to add a new timesheet.
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You can also press Ctrl + to go straight to the Add New Timesheet button.
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Click the Cancel button to exit without saving.