diff --git a/lib/RevBank/Plugin.pm b/lib/RevBank/Plugin.pm
index a077516..ce786c6 100644
--- a/lib/RevBank/Plugin.pm
+++ b/lib/RevBank/Plugin.pm
@@ -22,7 +22,7 @@ sub Tab($self, $method) {
         ref $method ? $method : $self->can($method)
     ) or return;
 
-    my ($tab) = $attr =~ /Tab \( (.*?) \)/x;
+    my ($tab) = $attr =~ /Tab \( (.*?) \)/x or return;
     for my $keyword (split /\s*,\s*/, $tab) {
         if ($keyword =~ /^&(.*)/) {
             my $method = $1;
@@ -44,6 +44,14 @@ sub Tab($self, $method) {
     return keys %completions;
 }
 
+sub AllChars($self, $method) {
+    my $attr = attributes::get(
+        ref $method ? $method : $self->can($method)
+    ) or return;
+
+    return !!($attr =~ /AllChars/);
+}
+
 1;
 
 __END__
diff --git a/revbank b/revbank
index 20e1353..2b1ba3a 100755
--- a/revbank
+++ b/revbank
@@ -17,7 +17,7 @@ use RevBank::Global;
 use RevBank::Messages;
 use RevBank::Cart;
 
-our $VERSION = "5.0.1";
+our $VERSION = "5.1.0";
 our %HELP1 = (
     "abort" => "Abort the current transaction",
 );
@@ -28,6 +28,9 @@ my @retry;  # (@accepted, $rejected, [@trailing])
 
 my $one_off = 0;
 
+my %escapes = (a => "\a", r => "\r", n => "\n", t => "\t", 0 => "\0");
+my %unescapes = reverse %escapes;
+
 sub split_input($input) {
     $input =~ s/\s+$//;
 
@@ -57,7 +60,7 @@ sub split_input($input) {
     return \$pos if $pos < length($input);
 
     # End of string reached
-    s/\\(.)/$1/g for @terms;
+    s[\\(.)]{ $escapes{$1} // $1 }ge for @terms;
     return @terms;
 }
 
@@ -119,7 +122,19 @@ sub prompt($prompt, $plugins, $completions) {
         my @trailing = $word_based ? @{ pop @retry } : ();
         my @rejected = pop @retry;
         my @accepted = @retry;
-        s/\0SEPARATOR/;/ for @accepted, @rejected, @trailing;
+
+        if ($word_based) {
+            # Reconstruct quotes and escapes
+            for (@accepted, @rejected, @trailing) {
+                s/([;'"\\])/\\$1/g;
+                s/\0SEPARATOR/;/;
+
+                my $unescapes = join "", keys %unescapes;
+                s/([$unescapes])/\\$unescapes{$1}/g;
+                $_ = "'$_'" if /\s/ or $_ eq "abort";
+            }
+        }
+
         $readline->insert_text(
             $word_based
             ? join(" ", @accepted, @rejected, @trailing)
@@ -251,7 +266,13 @@ OUTER: for (;;) {
                     "unexpected trailing input (use ';' to separate transactions)."
                 );
 
-                my ($rv, @rvargs) = eval { $plugin->$method($cart, $word) };
+                my ($rv, @rvargs) =
+
+                    ($word =~ /[^\x20-\x7f]/ and $method eq 'command' || !$plugin->AllChars($method))
+
+                    ? (REJECT, "Unexpected control character in input.")
+                    : eval { $plugin->$method($cart, $word) };
+
                 if ($@ isa 'RevBank::Cart::CheckoutProhibited') {
                     @words or die "Internal inconsistency";  # other cause than trailing input