Exactly which hotkeys are you using? You can add easy to reach letters as well. Personally I use Q, E, R, T and 1-6 and then shift/control. Another modifier if you can't reach further than 4 and R is Alt, while it might be uncomfortable at the start getting used to it is probably the only way for you to not be forced to use a 10+ key mouse. Also how do you hold your hand over the keyboard, while 6 is quite far to reach, 5 shouldn't be hard to reach even with a small hand if you position your hand correctly.