Insert the opportunity to highlight the notifications of each team from the team selection menu. Currently it is not clear which team by the notification.

I noticed some errors on your website, mostly typos and small improvements that could be made. It would be cool if I could just send a pull request on GitHub/Gitlab.

It would be useful to indent own messages posted to channels, in addition to current shading with gray. Like in several other chat platforms do.

for most small company, there is no ldap servier or sso. but all most have email service, self hosted or saas like google mail.
if there is a authorization type called smtp authorization like oauth2(google,gitlab...), it will make company helpful more without make another authorization system, bothered with account management.

In a professional environment, it would not be polite to allow some kind of language specially in open channels. It would be very useful for admins to handle a small database of words not permitted in their channel and a filter that replaces the "offending words" for symbols or other words defined by them.

Edit others' messages in public channels. Give admins the right to restrict the editing rights to certain users and channels.

Use Cases:

1.) Something in a message is wrong, commit number, bug report number, link, etc.
2.) Move message to the appropriate channel, user might have posted it to the wrong channel

This of course also allows censorship, which is why a history of the messages would be nice.

I am on over 20 Slack communities. Adding each one one at a time to my mattermost apps will be slow and error prone.

Add a way to read my config from running slack apps, and/or discover all the slack communities a given email address is a member of, and import them all at once to the Mattermost apps.

Make the default user's avatars more random. Instead of just being a circle with the first letter of the user's username, use some hashing algorithm to generate some sort of identicons. An idea very popular nowadays (Github, GitLab, Gravatar, Slack, etc)

Currently when you scroll too far on Mac OS X, the entire page does this annoying sort of elastic stretch-back animation. This can be disabled by some simple CSS. Should be a pretty easy win. :)

One missing piece in the desktop apps is CTRL+F browser-like search.

There is a plan to implement 'search in current channel' (https://github.com/mattermost/desktop/issues/305), but implementing the browser-like find feature is closer to the web app experience

There is existing electron APIs for finding something on the page: http://electron.atom.io/docs/api/web-contents/#contentsfindinpagetext-options

Keyboard hides after clicking send button.

It would be better to persist the keyboard on screen after sending a message. This is a common use case for users to who want to send separate messages instead of creating paragraphs.

Hiding the keyboard should be triggered by the 'Done' button or touching the message display area.

While having users create their own accounts as a result of sending an e-mail invite, I'd like to be able to make users and assign them permissions and passwords right from the admin console, without having to configure SSO or drop to a command line.

In case of a new message it would be great if the application/ web interface would directly jump to the contact who sent the message.
Actually you get the notification and need to click on the marked contact to see the new message.

This should be optional.

The android app is playing sound, when receiving notifications, even if my phone is on vibration. Probably due to the webview used.

Like Slack, being able to create a snippet by clicking a button and choose from a droplist the language would be far less painful than typing ``` (especially for non-qwerty keyboards).

It would be more intuitive especially for coders who discover the platform. Thanks!

Propose to use mailgun (an email service for developers) as an alternative to the SMTP server. The open-source blog platform ghost uses it and it is very easy to configure (instead of a whole server mail to install and secure).