Being without the GXL license for either version 5 or 6, I adapted the SlotMetal.il form to create a Program Binary Bus form, and changed its enterPath function to an enterPoints function.
The attached code will accept points for via connections between a data bus and the least significant instance in a one-dimensional array - eg row or column of decoders - and place all the remaining via connections to the array.
It incorporates some checks for duplicate point entry and to ensure there are sufficient bits to program the number of instances in the array. This is only set up to operate using v5 commands, but it shouldn't be too hard to modify. I have already included a variable in the code to store the results of dbGetDatabaseType(), but it isn't used.
Assumptions are that the data bus has consistent pitch between all signals and uses the same via connection for all inputs; there is consistent pitch between each true and complement pair (this does not require them to be adjacent though); the programming is conventional binary order from least significant instance to most significant in one direction (up, down, left or right) - no mirroring.
The core of the program uses the via parameters from the form to create a via symbolic for each point entered, for each cell instance, using a binary repeating pattern, modifying the X or Y coord for each via placement with respect to the initial point selected for each respective bit from LSB to MSB.
I don't have the benefit of the SKILL IDE and it hasn't been evaluated and given a LINT score, so please forgive any opportunities to improve the code!