Changed Alt + X to start scrolling and increase speed.
Changed X to toggle pause/resume instead of stopping.
Changed Up/Down to adjust speed instead of interfering with manual scrolling.
Changed Space and Esc to fully stop scrolling at any time.
Changed Page Up/Down to always pass through while updating memory without pausing.
Added behavior where Mouse Scroll Up/Down pauses scrolling and updates memory.
Added memory updates for manual scrolling during pause without interference.
Improved HUD to dynamically display speed or pause status.
