DISCLAIMER: THIS IS A SCRIPT I MADE USING AUTOHOTKEY, ITS VERY SIMPLE AND IT IM QUITE SURE IT WONT YOUR PC ANY PROBLEM, BUT I WOULD NOT BE RESPONSIBLE FOR ANY CONSEQUENCES FOR USING THIS SCRIPT 

THIS IS PERSONALIZED SCRIPT SO IT MIGHT NEEDS A LITTLE TWEAKING FOR EACH PC. EXPECT SOME BUGS DURING FIRST TIME USES AND CONTACT ME SO I GUIDE YOU THROUGH TO FIX THEM

FEEL FREE TO CONTACT ME IF  YOU WANT TO CUSTOMIZE MORE HOTKEYS FOR MT4

USAGE:
UP/DOWN arrow key: increase/decrease TF
R: draw rectangle
T: trendline
H: horizontal line
V: vertical line
Q: zoom in
W: zoom out

HOW TO INSTALL:
1. Install auto hotkey
2. search(from taskbar/start menu) and open %appdata% folder
3. open folder Microsoft -> Windows -> Start Menu -> Programs -> Startup
4. Put the "MT4_Shortcut" script file inside the Startup folder so it will automatically run the next time you boot the PC
5. right click the "MT4_Shortcut" script file and choose edit script
6. look up the text "YOUR MT4 WINDOWS NAME HERE" on the 3rd line of the script
7. replace that text with your MT4 window name. see the "Window name.png" for the example. It is case sensitive so you should write EXACTLY how it is. 
8. save the script and close it
9. right click again on the script, choose run as administrator
10. open MT4, open a chart, press up and down arrow key to test the script
11. if done correctly up arrow will increase TF, down will decrease TF. Test other hotkeys too
12. you dont need to do this every time, the next time you boot your PC it will be already running

DONE