What screenshots would you like to have

the module could have an option of being active or idle.

You mean, using json_encode instead of serialize?

known bugs/malfunctioning in userlog module:
1- userlog will not work in XOOPS255/index.php (homepage) when no module is set for start page.
there is a bug in XOOPS255/header.php
solution:
in XOOPS255/header.php exit() should be commented.

$xoopsPreload->triggerEvent('core.header.checkcache');
    if ($xoTheme->checkCache()) {
        $xoopsPreload->triggerEvent('core.header.cacheend');
        //exit(); // irmtfan comment this
    }

more information here: http://sourceforge.net/p/xoops/bugs/1261/

2- You cannot select many items in userlog > blocks > views block.
It is because of a length limitation in options field in newblocks table in xoops 255 and xoops 26.
solution:
in XOOPS255/kernel/block.php and XOOPS26/kernel/block.php
line 40:

$this->initVar('options', XOBJ_DTYPE_TXTBOX, null, false, 255);

with this:

[code]
        $this->initVar('options', XOBJ_DTYPE_TXTBOX, null, false, 600);

Then go to your database and change the field options length in newblocks table to higher number than 255.

3- When the URL or The REFERER is longer than 255 characters you have a warning and log will not be stored in database but it will be stored in file.
You can see this warning:

Warning: Insert failed in method 'cleanVars' of object 'UserlogLog' in file /class/model/write.php line 280

It is because I decide to limit URL/Referer to 255 characters because of better performance.
solution:
If you really need to save URLs with more characters than 255. do the following.
a) go to userlog/class/log.php and change the below indicate lines to your desired values.

$this->initVar("url", XOBJ_DTYPE_TXTBOX, null, true, 500); // change this
        $this->initVar("script", XOBJ_DTYPE_TXTBOX, null, true, 50);
        $this->initVar("referer", XOBJ_DTYPE_TXTBOX, null, true, 500);// change this

b) go to your database and change 'url' and 'referer' fields in table mod_userlog_log to your desired values.

@Mamba: in mastop_go2 that filter show/hide has these limitations:
1- It cannot remember the last click and it always will be hide by default.
2- It cannot change its own text/image/icon/alt/title when you click

In userlog i implement the final solution for these in a toggle that i learned from "newbb"

Also please let me know if you can find any good example for an export system.
I think export to excel, csv, json would be enough.

- I have now 306 files, each 1 MB. How would it be possible to "merge" them together, if I would want to do some analytics (e.g. to find out where people go the most, or to retrace steps of a hacker)

- how can we have a cron job zipping them together into one file?

- maybe there could be another part of the application that could do some analytics, with charts (e.g. showing which continent/country people coming from, which module is the most popular)