Well i'm not saying the group is stupid or anything like that just to make it clear now, however I'll tell you what i would have done from a standpoint of my characters.
10,000 for each kill paid to the person who gets the kills? Easily fixed.
All the players agree that no matter who gets the kills they are going to put it into a pool at the end and split it evenly. 5 enemy kills? 50,000 Nuyen? Split it evenly no matter if 1 guy got 4 of the kills. Probably fixed. That's what I would have done. Anyways obviously the group didn't think of that or thought their characters wouldn't do that I'm not sure which. It was fair. It sounds like your players deserved that a bit.
I just have two questions one for FastJack and one for you.
Fastjack, would you mind sharing a few examples of the missions you had to convince this mercenary technomancer to work with his team? I just recently had a problem where I gave the team 3 possible missions to take and they couldn't decide so I basically ran 2 missions at the same time during the same session because they couldn't make up their mind which to do. <.< Personally, that got me frustrated so examples would be VERY much welcome.
Also to AlexHaze.
I really would like to know how they killed a dragon curious. It's been debated at my table. I am currently captured by a dragon in Ares property. <.< In a room and they are in human form. From reading the book it sounds like they get the average stats of a human while in human form so I'm thinking the DM over played the Dragon's abilities when I fired at it with 2 pistols. My hits were 3 hits, 4 hits, 4hits, and 5 hits from one initiative pass. The Dragon dodged the first one, the second one used edge and passed. Next one had to use edge. (still didn't make it so rolled damage and used edge). Next, tried to use edge (DM rolling horribly by the way) still hit, and then used edge on the damage soak. (he was usuing the stats for the body of a dragon in dragon form however) I was using a Slivergun from Ares. (ironic no?) on an unarmored humaniod. (i don't know if dragons get natural armor and if that counts to the +5 dice armor gets against fletch anyways) I think I should at least damaged the dragon

. The DM told me however the real reason for this was that he just wanted to get the characters that had some bad notoriety gone so he could start a new campaign. (which he hasn't been able to get running yet xD) Anyways the dragon after dodging that broke my weapons with 35 str roll. (again dragon form amount i think it would be different as human form correct me if i'm wrong.)
Sorry, I may be going off topic I appologize for my questions but still a newish DM starting. If I need to post this somewhere else I will. Gomenasai!