How to increase the number of entries in select list?

The length of select lists in the Web Client is limited to 50 by default. However, you can change the value if necessary 
by adapting the DWSelectListLength value in the DWWebClient.settings file, which in a default installation is located in C:\Inetpub\wwwroot\DWWebClient.
file: C:\Inetpub\wwwroot\DWWebClient\DWWebClient.settings
<add key="DWSelectListLength" value="100"/>
Restart the Application Pool which is assigned to the Web Client afterwards.
Note: A high value may have a negative impact on the perfomance!