bbPress.org

On the login widget it has a register button. But it has no ID, so I had no choice but to use .user-submit like this:

/* Main buttons */
#bbp_user_edit_submit,
#bbp_topic_submit,
#bbp_reply_submit, #bbp_topic_content-tmce,
#bbp_topic_content-html,
#bbp_reply_content-tmce,
#bbp_reply_content-html,
#bbp_search_submit,
.user-submit {
	text-shadow: none;
	font-style: normal;
	background: #d35438 !important;
	color: #000 !important;
  text-align: center;
  border-radius: 4px;
	-moz-border-radius:4px;
  -webkit-border-radius:4px;
	border: white 1px solid;
  -moz-box-shadow: none !important;
  -webkit-box-shadow: none !important;
	box-shadow: none !important;
}

/* Main buttons - hover */
#bbp_user_edit_submit:hover, #bbp_topic_submit:hover, #bbp_reply_submit:hover,
#bbp_topic_content-tmce:hover,
#bbp_topic_content-html:hover,
#bbp_reply_content-tmce:hover,
#bbp_reply_content-html:hover,
#bbp_search_submit:hover,
.user-submit:hover {
	color: #fff !important;
  -moz-box-shadow: inset 0 0 20px #000 !important;
  -webkit-box-shadow: inset 0 0 20px #000 !important;
  box-shadow: inset 0 0 20px #000 !important;
}

It would be nice for consistency that this button have an official ID along with any other buttons missing the ID.