diff --git a/jssrc/term_input.js b/jssrc/term_input.js
index 367c06e..3fee7f0 100644
--- a/jssrc/term_input.js
+++ b/jssrc/term_input.js
@@ -144,7 +144,7 @@ var Input = (function() {
 			if (str.length>0 && str.charCodeAt(0) >= 32) {
 //				console.log("Typed ", str);
 				// prevent space from scrolling
-				if (e.which === 32) e.preventDefault();
+				if (evt.which === 32) evt.preventDefault();
 				sendStrMsg(str);
 			}
 		});
diff --git a/jssrc/term_screen.js b/jssrc/term_screen.js
index 9679d9d..8b0593a 100644
--- a/jssrc/term_screen.js
+++ b/jssrc/term_screen.js
@@ -157,7 +157,7 @@ class TermScreen {
     };
 
     this.canvas.addEventListener('mousedown', e => {
-      if (this.selection.selectable || e.altKey) {
+      if ((this.selection.selectable || e.altKey) && e.button === 0) {
         selectStart(e.offsetX, e.offsetY)
       } else {
         Input.onMouseDown(...this.screenToGrid(e.offsetX, e.offsetY),
@@ -275,8 +275,11 @@ class TermScreen {
       }
     });
     this.canvas.addEventListener('contextmenu', e => {
-      // prevent mouse keys getting stuck
-      e.preventDefault();
+      if (this.mouseMode.clicks) {
+        // prevent mouse keys getting stuck
+        e.preventDefault();
+      }
+      selectEnd(e.offsetX, e.offsetY);
     });
 
     // bind ctrl+shift+c to copy
@@ -903,6 +906,10 @@ class TermScreen {
     const audioCtx = this.audioCtx;
     if (!audioCtx) return;
 
+    // prevent screeching
+    if (this._lastBeep && this._lastBeep > Date.now() - 50) return;
+    this._lastBeep = Date.now();
+
     let osc, gain;
 
     // main beep