Why
Fire up menu shortcuts with your left hand only, so you can use the mouse at the same time. Easy to remember system for Cmd/Shift/Ctrl/Alt combinations together with letters, numbers, space, backspace, tab, and escape.
How
Strike one of the modifier briefs explained below, then the lefthand letter or binary (!) number that should be triggered with those modifiers.
Examples
SKPWR/KRShift+Cmd+cSKHRA/R-Shift+Alt+Control+rSH/34Shift+3THRA/14Alt+9KHR/SKControl+Escape
Single modifiers
KPWRCommandSHShiftTHRAAltKHRControl
Shift/Alt/Control combinations
SHAShift+AltSKHRShift+ControlKHRAAlt+ControlSKHRAShift+Alt+Control
Command key combinations
SKPWRCmd+ShiftKPWRACmd+AltKPWHRCmd+ControlSKPWRACmd+Shift+AltSKPWHRCmd+Shift+ControlKPWHRACmd+Alt+ControlSKPWHRACmd+Shift+Alt+Control
All you have to remember is this:
(S=Shift) + KPWR=Cmd + (A=Alt, H=Control)
Special keys for the second stroke
TPWTabSPSpaceSPWBackspaceSKEscape
Numbers for the second stroke
Binary system from right to left using number bar and STPH
#4: 1#3: 2#34: 3#2: 4#24: 5#23: 6#234: 7#1: 8#14: 9#1234: 0 (this would actually be 15, but this is easy to stroke and remember)