Hi Mario, I'm glad that you are liking MoI!

It is possible to set up a shortcut key in MoI that will make a screen capture at a higher resolution than the current display on the clipboard that you can then paste into an image editing program, for that script see this previous post:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1049.5


> also is this modo 501 the most compatible rendering
> package with moi.

There are quite a few people who use MoI and Modo in combination with each other but there are also a variety of other rendering packages out there and any one is not particularly "more compatible" than another one.

A few popular choices though are Modo, Cinema4D, and one newer one that seemed to be pretty easy to use is SimLab Composer.

Some rendering programs have more options for tweaking things but can also take longer to learn how to use. Some are easier to learn but with somewhat less flexibility and control. So you may want to use some trial versions of some rendering programs to experiment with a few different ones before deciding which one suits you the best.

- Michael