As Burg has pointed out, the improvements to walls have actually swung the pendulum towards the criminals, as they're at zero risk of getting summoned as long as they take proper precautions. I was thinking their profession could be made a bit more risky by making them recognizable for a significantly longer time, if not summonable. Mind you, this is not meant to be a complete solution of the issue, but just one small measure towards it. So, on to the idea:
- You can craft a ranger's notebook, which has a number of pages dependant on it's quality.
- With a scent you can open a case in the notebook, which consumes a number of pages.
- You can add scents to a case if they come from the same perpetrator.
- The more scents a case has, and the better they are (determined by ranger's per*exp and criminal's int*stealth, as well as age), the longer the case stays open; murder is worth more than theft etc.
- The number of pages that a scent takes to add depends on per*exp vs int*stealth as well.
- If you have a notebook in inventory, and you see a criminal whose case it contains, you get to make a per*exp check vs his int*stealth, if you pass the check you recognize him.
- Expired cases are closed and don't grant you checks; pages are not refunded.
- Scents can be copied between notebooks, and between a notebook and a wanted poster.
- Wanted posters can be built on village claim by authority figures, everyone within a certain radius gets a check to recognize the criminal if he enters this radius.
- To avoid inventory clutter, each piece of ranger gear should have a pocket that can hold one notebook (and notebook only).
The general idea is that criminals wouldn't be able to just wait for the scents to expire and then slip into anonymity. Somebody who robs and kills a whole village wouldn't be able to show his face in Constantinople for months, lest he be recognized and killed. Conversely, if somebody steals a single item his case wouldn't last much longer than the scent. If you spread your criminal activities around, rangers won't be likely to connect them to a single case. Rangers, on the other hand, could organize into an Interpol of sorts, exchanging notebooks to better curb crime in their area. Of course, you can't trust anyone's notebook, that random guy may be trying to paint a fellow ranger as a murderer without a cause.