There are a couple of distinct issues involved here. IIRC (I started testing 7 but aborted that effort early on), the typical and default custom installs included Remote Assistance. Arguably, such a feature should not be bundled with an anti-malware tool let alone installed by default. The ability to opt-out is something but arguably opt-out is insufficient. IIRC, the appearance was that by unchecking the installation of Remote Assistance, that component would literally not be copied to an Avast directory and thus all related functionality would simply not exist on the target machine. Theoretically speaking, that may or may not be the case because some functionality could be built into other components. Only those intimately familiar with the code would know. Routing Remote Assistance traffic through avast Servers is on one hand (potentially) convenient for (less sophisticated) users but doing it that way also creates additional security/privacy issues. So yes, there does seem to be some must consider issues with respect to the Remote Assistance feature.
PS: I don't recall seeing an option to prevent the installation of avast remote management portal functionality. It would be good if that functionality could be completely eliminated, included as is, or included in private remote management only form (where management via avast servers is impossible but management via private server is possible).