The issue-index currently lacks a "take" action for
unassigned issues. The idea is to simple put a "take"
into the column of 'Assinged To' if an issue is
unassigned. Clicking on this link is a very easy way
get this issue assign to the loged in user.

Simply place this into issue.index (patch included):

   <td tal:condition="request/show/assignedto">
     <span tal:condition="i/assignedto"
tal:replace="i/assignedto" />
     <a    tal:condition="not:i/assignedto/plain"
           tal:attributes="href
string:issue${i/id}?:action=edit&assignedto=${request/user/id}">--
take --
     </a>
   </td>

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That's a nice idea - but I think I'll include it as an example rather than have it 
implemented by default. I'll leave this issue open for a while to see if there's 
any other feedback though... 
 

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-1 on changing default templates, for three reasons:

1) I wouldn't want to take an issue without examining 
the full text and fields of the issue!

2) It's a slippery slope from there to also 
having "resolve" or "reject" links in the issue-index 
view -- all these are actions which rightly belong on the 
issue page itself, not on a multiple-issues overview 
page.

3) It also makes all issue views specific to "developer" 
users: I also have "manager" users who view the issues, 
are nosy on some of them, but will never want to take 
them on. Adding a "take" link on their issue lists just 
clutters the interface and reduces the real estate 
available for useful information.

Agree though it'd make a good customisation example -
- maybe even one which could be extended to consider 
user Roles.

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added as an example in customisation doc.