Вариант без jquery, изменить значение в инпут и нажать F2
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<table width="400">
<thead>
<tr>
<th>Title 1</th>
<th>Title 2</th>
<th>Title 3</th>
<th>Title 4</th>
<th>Title 5</th>
<th>Title 6</th>
</tr>
</thead>
<tbody>
<tr>
<td><input></td>
<td><input></td>
<td><input></td>
<td><input></td>
<td><input></td>
<td><input></td>
</tr>
<tr>
<td><input></td>
<td><input></td>
<td><input></td>
<td><input></td>
<td><input></td>
<td><input></td>
</tr>
</tbody>
</table>
<script>
var table = document.querySelector("table");
table.addEventListener("keydown", function(a) {
var c = a.target;
if ("INPUT" == c.tagName && 113 == a.keyCode) {
var d;
for (a = c.parentNode; "TR" != a.tagName && a;) a = a.parentNode;
if (a) {
a = a.querySelectorAll("input");
for (var b = 0, e = 1; a[b]; b += e) a[b] == c && (d = c.value, e = 2), void 0 != d && (a[b].value = d)
}
}
});
</script>
</body>
</html>