The fact that MI is quite hard to do in Perl, and considering that most authors make it even harder might also be an not insignificant reason why you don't see many modules making use of MI.
But I'm not saying you should use MI. I'm just saying it's impolite to make it harder for others to use MI. The harder you make it for others to do things (for instance, setting magical variables without using local, not using name spaces, writing code that isn't cross-platform), the less useful your code is.
Let's not forget the question of the OP: Are there any limits on what you can/can't or should/shouldn't put into a constructor?. An answer to that question is don't put initialization of your object in the constructor, because it makes it harder to do MI.
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.