So I'm new to the community but have been following this community's endeavors, projects, etc. for the past year or so. One of the most exciting projects, in my opinion, underway currently is Harsh Doorstop. Not only does it revolutionize the way in which games are made (through piecing them together using artists and perfectly functional resources to do so) but it also allows for the community to build, quite literally, its own game.
One mechanic that I have found to be lacking in my limited (admittedly) experience with the tactical genre of games is that of construction. The logistics portion is generally adequately covered to provide a great blend of fun cooperation and realism, but games such as Squad have a rather dull, overpowered, unrealistic, and spammy construction mechanic. The idea of making construction in tactical games more "believable" is somewhat challenging considering the necessary experimentation with concepts, but I understand this project to be all about that, assuming the community is interested in such a mechanic.
Some suggestions of mine are to keep the same "voxel-esque" style of placing down fortifications, but breaking down the far too general options in to, for example, three stacked sandbags as just one of numerous small configurations to make the construction only slightly more tedious. Miscellaneous objects also necessary to certain fortifications should also be implemented into a streamlined HUD to facilitate a smooth yet balanced experience in relation to construction. A balance is all too necessary for this mechanic, however, because one of the biggest hallmarks of tactical game is the ability to utilize cover effectively whether that cover is already present or fashioned on the spot.
The benefits of implementing this could potentially be amazing. A significant reduction in insanely-well positioned "superfobs" that effectively end matches is just one of those potential benefits. I doubt that this idea is new in any way and that you've probably toyed with the concept before, but putting it in writing on the forum was something that I thought would be worthwhile. Either way this is just a simple suggestion (actually I wouldn't know if something like this is already underway), so please take it as such and continue the great work with this community.