During the forum thread for NexSense ROM, some key issues weren't able to be fixed and many people tried. The issues are much deeper than just modifying a file, first you have to know what's in HTC framework and add it to your ROMs. Now the problem was described by rootSU's post. It is unfortunately difficult.
This means that yes, it's not impossible to get HTC apps and and an HTC ROM, it just hasn't been done yet by a skilled developer. The OP of NexSense made tons of progress though.