when using all 10 tools, and assigning them individual keyboard shortcuts, the last tool will not be launched when doing the shortcut.

All 10 tools dont need to be used for this to occur, applies only to the final command in the list

To reproduce:

Create a batch file called b1.bat
"echo Hello b1"
"pause"

Create a batch file called b2.bat
"echo Hello b2"
"pause"

Tools-> Pref -> User Tools

As tool 1 set
Command "C:\\b1.bat"
And use CTRL + 1 as hot key

As tool 10 (0) set
Command "C:\\b2.bat"
And use CTRL + 0 as hot key

Pressing CTRL + 1 executes the batch file
CTRL + 0 does not

This shouldn't be so hard to fix, and it's really annoying that you can only use nine tools with shortcut keys. Personally, I'd like more like 20 tools with shortcut keys.