Unfortunately, there is no option to modify this. But you can do it manually like this:
// disable default mouse paste
terminal.MousePasteEnabled = false;
// define mouse paste for middle button
terminal.MouseClick += (s, e) =>
{
if (e.Button == MouseButtons.Middle)
{
// get text from clipboard
string text = null;
if (Clipboard.ContainsText(TextDataFormat.Text) ||
Clipboard.ContainsText(TextDataFormat.UnicodeText))
text = Clipboard.GetText();
if (text != null)
{
try
{
// send text to server
terminal.Scripting.Send(text);
}
catch
{
// handle pasting errors if necessary
}
}
}
};