the problem would be in passing the collected credits from the front-end to the actual game.
Yep, I really have no idea how to pass this by.
I'm using my cab only at home, but for authency a cab without a working coindoor isn't a cab in my opinion.
I can live with it, but it's not very elegant when my instructioncard at the bezel reads: "Hold player1 and press player2 for menu - current credits get lost"
(By the way, is this correct/good english? I'm still thinking if I'll make the instructions bilingual)
So for this I'd like to have the same solution, but I guess you can't have it all.
Also I'm still not sure if I can configure all games to register 5 credits on coinslot2 - did you Americans only had coindoors featuring the same cash-value??? Somehow any game I remember (except Gauntlet) had a slot for 1,-DM and 5,-DM those days, with Visual Pinball you can't even register with the second coinslot!
What is even worse, as long as the frontend shows up, thrown in credits get totally lost. I'll turn the coindoorlamps off as long as the menu is present to resolve this, but it would be niecer if it just works.