Perhaps the binding of a mod-wheel could work, you can try and hope.
connect HW-controller
The basic principle in connecting anything to a keyboard feature is:
Find the lmms-component you want the HW-MIDI-feature to control (for a mod-wheel filter freq could be a RL example)
Right click on the the lmms-component and a list will pop up.
In the list select "Connect to controller", a "Connection Settings" box will pop up.
Make sure MIDI controller and Auto Detect are lit up, then activate the HW-MIDI-feature on your MIDI-keyboard!
Often it will show as ch1, controller 2
Click OK and the HW-MIDI-feature should now control the lmms-component you selected.
you can set up any other lmms-component control on a MIDI keyboard the same way. It sets it up as a different controller (CC) number.
Are the pads for percussion? You then need one connection on a different pad for each lmms-percussion instrument
Let us know the outcome !