What is a good system you think should be able to reward according on type of kill?

mine is

Player x

Conditions:
Current player kills at least 1 x-unit owned by player x.

Actions:
Set kills to 0.
Add 10 points to custom.
preserve trigger.

I barely remember the triggers...

That doesn't work.

Perfect kills to cash

No I will not explain to you how perfect kills to cash works. Yes I know it's confusing.

The wiki link will do fine if you can understand it. My map in there details how to make perfect kills to cash much faster than usual. I can't recall if it uses flame traps, but if it does, know that it severely limits the weapon sprite limit. I think zerglings are best overall, especially when speed is not imperative. For RPGs, it's definitely not.

The wiki also has descriptions of other methods, the best of which is probably custom score matching/death counts of the foe. It's fast, and for the most part, perfectly accurate. The only way it messes up is if somehow you kill a whole bunch of different number of different units at the same time, then kill some more before it's completed.

If you need more examples of these, search for kills to cash in the database.

I need to know the killscore for each unit...

Boy, you really have to learn to use the wikis. If the SEN one fails you try the Maplantis Wiki. Click units and scroll down.

ive decided that exp is shared because stupid blizzard didnt put this trigger:

Set Kills: PlayerX set to 0 kills of unitX.

I mean COME ON!!!! Someone hack SC and put this in please!

Ask Farty. He makes triggers for modders. Maybe it's in his power.

It is not. Starcraft has limitations, that is one of the more annoying ones.
Perfect kills for cash is one way around it, except it will only work for units in general and not specific types of units.

What you need to do is brute force things, have:
CurrentPlayer kills at least 1 x
CurrentPlayer kills at least 2 x
CurrentPlayer kills at least 3 x
CurrentPlayer kills at least 4 x

etc.

Alternatively you can base it off kill score and make the units that give higher kill score harder to kill, this is what most action RPGs (such as special forces extreme) do.

Are you aware that I was talking about modding?

You don't even need to go as far as modding.

Step 1: Downgrade
Step 2: EUD (action) enabler
Step 3: Go nuts

You can't do it for a multiplayer battlenet RPG though.

Any way I decided shared exp (LAME), I hope I get this through without being mad.

EUD actions could modify kills? Cool.

yeah, if its for single player...