How to define the fundamental period parameter, x, for different seismic systems in the X and Z directions?

Hello,

Under the seismic parameters menu in STAAD.Pro, one can manually enter the required parameters to determine the approximate fundamental period of a structure based on ASCE7-10 (section 12.8.2.1, equation 12.8-7). However, as it is in STAAD.Pro, one can only enter one instance of the "x" parameter for both the X and Z directions, depending the seismic system used. This is problematic in many situations since one can define a moment frame in one direction (say X) and braced frame in another (say Z). From table 12.8-2 of ASCE7-10, the "x" value is unique to each seismic system. It seems like STAAD.Pro assumes the same seismic restraint system in both direction. Is there a way to circumvent the issue if you have a different seismic system in each direction? Will future versions of STAAD.Pro address this issue?

Thank you!