Client traffic control

Ok ... Have a look at Rate Shaping

http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/tmos-concepts-11-4-0/15.html

but also note:

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About the direction setting

Using the Direction setting, you can apply a rate class to client or server traffic. Thus, you can apply a rate class to traffic going to a client, to a server, or to both client and server. Possible values are Any, Client, and Server. The default value is Any.

Specifying direction is useful in cases where the nature of the traffic is directionally-biased. For example, if you offer an FTP service to external clients, you might be more interested in limiting throughput for those clients uploading files to your site than you are for clients downloading files from your site. In this case, you would select Server as the direction for your FTP rate class, because the Server value only applies your throughput restriction to traffic going from the client to the server.

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With the above in mind, you may also look at

https://devcentral.f5.com/Community/GroupDetails/tabid/1082223/asg/50/aft/3691/showtab/groupforums/Default.aspx

HTH