modify alt =

If you open your Hotkey Glossary you will see that the Add Glossary Entry Hotkey is defined as follows:

{CopySelection}{Wrap}
{TrimLeftClipboard}{Wrap}
{AddGlossaryEntryDialog}
input = "text"
moveToTop = "n"
{/AddGlossaryEntryDialog}{Wrap}
{NoSpacing}

You can change it. From what you say it seems you would prefer it to open the Add Glossary Entry window blank. If that is the case, just change it to:

{CopySelection}{Wrap}
{TrimLeftClipboard}{Wrap}
{AddGlossaryEntryDialog}
input = "blank"
moveToTop = "n"
{/AddGlossaryEntryDialog}{Wrap}
{NoSpacing}