Cyberjacks get a little more traction once you interpret their Initiative Bonus as Initiative Dice bonus, as it was originally intended.
I had the same thoughts as you, but getting bonus minor actions and access to matrix specific edge actions totally reshape the landscape and suddenly make it into an almost 'must have' implant for any serious decker.
While on the rigging side the control rig implant is a 'must have' for them (the RCC doesn't even come with a sim module of its own and the control rig is required if you ever wish to make the 'jump' anyway).
While you are allowed to combine both of them, this will be quite an investment both resource wise and essence wise.
Also, since it seems as if you don't really need a cyberdeck for a majority of all matrix actions anyway (that riggers may spoof a command to a vehicle slaved to someone's PAN without having an attack or sleaze attribute and while only having outsider access on the PAN).
And with a direct connection it seems as if you are allowed to take outsider actions (such as spoof command, which doesn't require a cyberdeck) on a device that is part of a nestled host as well (and that you perhaps may even get a wireless direct connection just by having enough physical proximity).
Restrict the RCC noise reduction to remote control in the WAN, so that it can´t be used as a hacking aide.
You have to choose if you want to use the RCC program slots or the Deck´s Program slots...
I like this.
As long as we are discussing house rules....
The book seem to assume that you are using one distinct device to 'access the matrix' with.
If this device is a cyberdeck then I think your cyberdeck should soak matrix damage and your network should get attack and sleaze attributes required for hacking and cybercombat - and that it is your cyberdeck that provide you with your program slots (but you don't get noise reduction or sending same command to several drones or any other advantage that RCCs provide). If you also have commlinks or a cyberjack etc in your network then you get to use them to complement the DF part of your ASDF array, but not for the AS part of your ASDF array.
If this device is a RCC then i think your RCC should soak matrix damage and that you get noise reduction. sending same command to several drones, higher slave limit and sharing autosofts with slaved drones etc - and that it is your RCC that provide you with your program slots (but you don't get attack or sleaze attributes required for hacking and cybercombat). If you also have commlinks or a cyberjack etc in your network then you get to use them to swap around whatever you use for your DF part of your ASDF array, but since you are not using a cyberdeck to 'access the matrix' with I don't think you should get the AS part of your ASDF array. Not even if you have one in your network. That to get the AS part of the ASDF array I think you should actually use a cyberdeck to 'access the matrix' with.