Are you able to merge that code with the mainline?

You can use this URL with System Patches package for 2.2.x:

https://github.com/doktornotor/pfsense/commit/119d9703ba232ecf97d9e58c742ceee9e376c57d.patch

(There's PR 1841 for 2.2.x, never been merged. I don't have a patch for 2.3 snapshots yet.)

---
--- a/usr/local/www/widgets/widgets/smart_status.widget.php
+++ b/usr/local/www/widgets/widgets/smart_status.widget.php
@@ -32,7 +32,21 @@
 require_once("pfsense-utils.inc");
 require_once("functions.inc");
 require_once("/usr/local/www/widgets/include/smart_status.inc");
+
+if (isset($_POST['smartstatusfilter'])) {
+	$config['widgets']['smartstatusfilter'] = htmlspecialchars($_POST['smartstatusfilter'], ENT_QUOTES | ENT_HTML401);
+	write_config("Saved SMART Status Filter via Dashboard");
+	header("Location: ../../index.php");
+}
 ?>
+
+
+	

<form action="/widgets/widgets/smart_status.widget.php" method="post" name="iformd">
+		Comma separated list of drives to NOT display in the widget

+		
+		
+	</form>

+

@@ -42,35 +56,50 @@

-$devs = array();
-## Get all adX, daX, and adaX (IDE, SCSI, and AHCI) devices currently installed
+/* Get all adX, daX, and adaX (IDE, SCSI, and AHCI) devices currently installed */
 $devs = get_smart_drive_list();
+/* Get list of drives to hide from the widget */
+$skipdrives = array();
+$skipdrives = explode(",", $config['widgets']['smartstatusfilter']);

-if(count($devs) > 0)  {
-	foreach($devs as $dev)  {	## for each found drive do
-		$dev_ident = exec("diskinfo -v /dev/$dev | grep ident   | awk '{print $1}'"); ## get identifier from drive
-		$dev_state = trim(exec("smartctl -H /dev/$dev | awk -F: '/^SMART overall-health self-assessment test result/ {print $2;exit}
-/^SMART Health Status/ {print $2;exit}'")); ## get SMART state from drive
-		switch ($dev_state) {
-		case "PASSED":
-		case "OK":
-			$color = "#90EE90";
-			break;
-		case "":
-			$dev_state = "Unknown";
-			$color = "#C0B788";
-			break;
-		default:
-			$color = "#F08080";
-			break;
-		}
+if (count($devs) > 0)  {
+	// For each found drive ...
+	foreach($devs as $dev)  {
+		// unless configured to be hidden ...
+		if ((!in_array($dev, $skipdrives))) {
+			$dev_ident = exec("diskinfo -v /dev/$dev | grep ident   | awk '{print $1}'"); // get identifier from drive
+			$dev_state = trim(exec("smartctl -H /dev/$dev | awk -F: '/^SMART overall-health self-assessment test result/ {print $2;exit}
+/^SMART Health Status/ {print $2;exit}'")); // get SMART state from drive
+			switch ($dev_state) {
+				case "PASSED":
+				case "OK":
+					$color = "#90EE90";
+					break;
+				case "":
+					$dev_state = "Unknown";
+					$color = "#C0B788";
+					break;
+				default:
+					$color = "#F08080";
+					break;
+			}
 ?>
-		
-			
-			
-			
-		
-+			
+				
+				
+				
+			
++	}
 }
 ?>

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+
+
+

(No, I don't have any patch to add -d scsi.)