I noticed that if I actually update the values for Tool Title (Above the tool), Button Text (Text in tool menu), or Frame Height, the values are saved, but the changes are not reflected in the UI.

Test case:

1. Log in to Admin Workspace
2. In External Tools select the Tools Available in System tab
3. Select the edit link to the right of a configured tool
4. Select the Allow radio button for "Allow tool title to be changed", "Allow button text to be changed", and "Allow frame height to be changed"
5. Save changes
6. Add the LTI tool you just edited to a site and keep the default settings
7. Launch the tool
8. Click the config icon in the upper right
9. Change the Tool Tittle, Button text, and Frame Height
10. Click Update Options button
11. Notice the settings are saved but the UI does not change

Note: The other user in-situ definable options such as Launch URL, Secret, Key, etc, seem to work properly

Integrated in basiclti 2.1.x #4 (See http://builds.sakaiproject.org:8080/job/basiclti%202.1.x/4/)
https://sakaiproject.atlassian.net/browse/BLTI-209#icft=BLTI-209 merge trunk r123326 (Revision 123591)

Result = SUCCESS

Merged 2.1.x r123591.

Don't forget to set the 2.1.x status to merge.

Verified with following test plan:

1. go to the Admin workspace External Tools, and add new LTI tool if necessary;

2. add the basicLTI tool to a site;

3. go to the site, launch the basicLTI tool. And click on the Edit button on the top right corner of the tool panel itself, and verify that the attributes shown in the edit screen is compatible with the the tool definition, i.e. if the "allow" is set for an attribute, the attribute input field should show up in this Edit screen.