Well I'm not quite sure what you mean. The kinda point of SR is to be open ended. Hell if you play long enough or your into throwing loads of EXP/Karma the way of the character's it not that hard to "level up" per say.
I remember first being described Shadowrun when I wasn't sure it would be fun, i've never been able to imagine a system that would work with guns well. I always thought in terms of DnD's lots of health gun does this much damage and at some point it would be rediculous how many bullets you can take. anyways off topic main point. When I heard about Shadowrun it was described to me that there are no "Classes" you make your character how you want. It was very appealing to me once I started making it. Confusing, I didn't know half what I was doing, and I may have built my character slightly illegaly within the BP but i know i'm pretty close.
It's the same with progression in shadowrun which needless to say seems very slow, however! you can alter that by giving out more Karma. And it gives the PC's the options to take their character go in which ever direction they want to go. I mean they may not always kick the most ass sometimes when they make their character as is with my GF. I resist trying to influence how she makes most of her characters because I often want to optimize or at least improve existing things.
In fact most recently in a DnD game I just started I rolled up a level 10 fighter. The DM gave us free range to do whatever we wanted well I've never played a straight up fighter, and I decided I wasn't going to worry about stats whatever i got was what i got and the highest one I decided was going into Charisma. Got an 18 so I put i there. (>.> it's 20 Charisma now..... <.< don't ask)
Anyways, there's also things you can do like hand out money so they can buy items to "upgrade" their character kinda like leveling up or create homebrew items.
Two sessions ago I handed out what i consider to be a bad ass katana blade. It's a katana blade that has a heavy field around it (probably magnetic) that deflects bullets slightly. I gave it a +2 dodge bonus if your getting shot at with bullets. I came up with the item because I would love to have an item like that. (most of the time i give away items i want for my character lol)
So I think there are plenty of incentives you could drop, they could "pick them up on the mission" like the guy who got that katana sword in my game. They happened to be in a companies territory and found that on the way out. It's a test version and he could probably sell it for a quite a bit of money but he wants it because it's unique. xD
(hopefully that answered your question?)
Edit: I saw the besides Nuyen and Karma in your post when i reread so this might not answer your questino at all...

well maybe the unique item i mentioned might help. *shrugs*