Questions concerning cooked roms vs branded phones [T-Mobile]

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I'll keep this relatively short so's not to bore anyone...lol.
I have a T-Mobile Dash 3G with WinMo 6.5 standard. The question I have is more towards the MyFave 5 service I have. If I flash a cooked rom....say the 3vo for Maple(Dash3G) will it remove that service from my phone? I know it won't actually remove the service itself because it's part of my plan, but will it remove the actual software the service uses?
I'm not sure why, (prolly from when I had my RAZR V3 without Fave 5 software), but I actually like it on my phone. I use both the service and software quite often so I'd really hate to lose it.
Lastly I noticed the rom comes with software like Resco Explorer and such, Is this something I will have to pay for later on or is it the full app? I have a copy of Resco's full app so I'm not too worried about it but it's something I'm curious about. Anyways, thank you guys!!

When flashing a ROM all the software included and data will be erased, even if you still having the service with your provider.
But on my experience with this great device or any other hTC, is that cooked ROM´s are always much better and faster than stock, and I´m sure you will be able to find the software you need in XDA
And don´t worry about resco it is included on ookba fantastic ROM amongst many other great features that stock don´t come with...

awesome orb thank you for the info. Yeah I went ahead and went with 3vo.3.00.401010 and although it works well, I found some significant bugs. MyFaves ctrl panel page is listing all my faves contacts as "undefined" with both numbers and names and the icons come up white. The circular style menu doesn't work at all. I used a CHome work around but other stuff is refusing to work as well; such as the HTCWeather service. The titanium weather that uses accuweather works but you have to have wifi enabled in order for it to update. HTCWeather's you didn't need to do that. Also for some reason when I try to add a city it won't actually add it in. The panel simply displays "add city" no matter how many times I add one.
Granted, by comparrison to the rest of the rom's significant improvements these are minor, but I also kinda feel like I have half of a phone now.
I'd actually mention the bugs in the rom thread but I've noticed that people don't really like to reply too much around here.
I'm by no means ungrateful at all, and I love the 3vo rom which is why I continue to use it despite the small issues. I'm wondering if it might be a radio version conflict for MyFaves but I'm not nearly experienced enough to even begin to look into it. It's one of those little nagging things.....lol.