The extension sets:
'shy' => 0
Some more details, just for your information (the shyness is not a problem for me at all).
In 4.0 RC2 sr_email_subscribe 0.3.1 (as downloaded from TER minutes ago, but not actually installed) results in an auto-generated ext_emconf.php that holds
'category' => 'plugin',
'shy' => 'false',
'version' => '0.3.1',
'dependencies' => 'cms,tt_address,sr_static_info,sr_feuser_register',
The value 'false' being a string value, this (according to bug 2817) evaluates to true, thus being shy. I noticed the same in RC1. The details page in the Extension Manager shows:
Version: 0.3.1
Category: Frontend Plugins
State: Stable
Shy? Yes
For example tipafriend in my 4.0 RC2 results in a generated ext_emconf.php holding
'shy' => 0
and is then not considered shy.
I don't know why the above is generated like this, nor what this is based on; I could not find any file holding the word "shy" in http://typo3.org/extensions/repository/search/sr_email_subscribe/0.3.1/details/
At bug 2817 someone writes "could you please check your local ("master") emconf file for this?" so I guess extensions come with some emconf in the T3X file?
A last note, which I guess is NOT causing shyness at all, but for the sake of completeness:
http://typo3.org/extensions/repository/search/sr_email_subscribe/0.3.1/details/ states "Warning: Some of the extensions (or versions) are not available in the official repository". That page marks sr_feuser_register 2.3.0- in red. I do not actually have sr_feuser_register downloaded (nor otherwise installed), neither have I installed sr_email_subscribe after downloading it from TER. But if I'm the only one encountering this shy "problem" for sr_email_subscribe, then maybe that's caused by unsatisfied dependencies...
Updated by 
Updated by