Hello there DaChevs! Glad you're finding some use for my script! No need to double-post though
You'll make hoz and h- nervous...
One caveat, which is pretty big if I'm guessing right what you want to use these for : there's no integrated multiplayer support as of yet, i.e., all inventory transactions at the moment are AFAIK entirely local. Since they depend on simple vehiclevariables though, there's no reason why someone more mp-savvy than myself couldn't make it work in MP as well. I guess
I've thought about how to implement things such as SPON money and other "variable-based" systems directly into RUG Inventory, but I didn't bother adding a function for that just yet since it's still in Beta (and likely to stay so until I get back to mah ArmA computer). However, using the functions already available in it there should be some possibility of making it work.
Since it's a lot harder however to manipulate RUG Inventory than a simple variable-based money system, it's probably for the best to change the SPON money values depending on the amount of "money" objects in the units RUG Inventory. So, for instance, have a simple looping script that runs every x seconds, and changes the SPON money values according to the amount of say "Money" in any one person's inventory. You can check how much of an item a unit is carrying using the RUG_Inventory_fstackcheck.sqf function (read script header for details on usage, one of the return values will be the total amount in the stack, which you can produce using select from the result of the call. Note that the functions are usually precompiled and can be called using a global variable named the same as the script without the sqf), although I'm not sure how to modify the SPON money values. If I don't remember wrongly, it's simply a vehiclevariable attached to each individual: so using something like Unit setVariable ["SPON_Money_Variable_Here", (RUG_Money_Amount_here)] should work out.
Sorry if this seems confusing, but I haven't really got anything here with me with which I can help verify these things, and besides as I told you I don't know exactly how SPON Money works so...
Good luck anyway!
Wolfrug out.