There are plenty of opportunities for non-'Mechwarrior adventures. My group has occasionally taken Shadowrun adventures and simply changed the settings and NPC characters to the BT universe. A few additional adjustments as appropriate, such as replace magic/net and mystical beasts with more appropriate opposition, and you have a perfectly workable BT adventure with no 'Mech combat. Turn a Shadowrun industrial espionage/sabotage adventure where your team attempts to break into a corporate facility into a BT industrial espionage/sabotage adventure where your team is trying to steal tech/specs from an enemy, delay production, etc. Replace the assigned Lone Star corporate security goons (including mages, drones, etc) with corporate security infantry detailed in TRO3085 or even a group of elementals with some in their armor and some outside.