Way to capture present ROM image prior to experimenting

[beluczywo]

See my other posts. On the Verizon Titan, it's fresh from the store. Is there a way to take an image with an off-line tool to dump what it looks like in a restorable way (other than loading Sprite which seems to be somewhat radio and firmware specific)? It seems like WideAwake ImCokeMan, and other hard-core experimeters have ways of capturing OEM images to evolve so I'm hoping there is a low-level tool using MTTY or something to do this.

What can I do and what can't I do if I want the flexibility of going back to stock? If I enable GPS since Verizon doesn't have a WM6.1, Radio 3.XX firmware out am I then locked into custom forever?

Thoughts if I have a HW problem in the next 12 months and need service on a tweaked phone (OliPro BL, GPS radio). Do you deliberately brick it altogether if you need to take it back? Any way for them to tell at the store? I don't want to be dishonest, but if you sell me something crippled/buggy and I then get it working much better because you are slow/non-customer-oriented, and then you give me grief when I have a HW problem because you can't distinguish HW from SW then I'm not feeling too much guilt since they set that situation up through unworkable policies. Not to mention, $150+/month in fees means I've paid more than enough revenue stream to expect something decent in return (like a replacement in the first 12 months of the HW regardless of how I've customized it in the meantime).